diff --git a/2D/Screens/BlockSelectScreen.cs b/2D/Screens/BlockSelectScreen.cs
index 1781f166a..86eec357d 100644
--- a/2D/Screens/BlockSelectScreen.cs
+++ b/2D/Screens/BlockSelectScreen.cs
@@ -247,7 +247,7 @@ namespace ClassicalSharp {
 		}
 		
 		public override bool HandlesKeyDown( Key key ) {
-			if( key == Key.Escape || key == Key.Q ) {
+			if( key == Window.Keys[KeyMapping.PauseOrExit] ) {
 				Window.SetNewScreen( new NormalScreen( Window ) );
 			} else if( key == Key.Left ) {
 				MovePointerLeft();
diff --git a/2D/Screens/ChatScreen.cs b/2D/Screens/ChatScreen.cs
index dd4dec997..ea3e1caa1 100644
--- a/2D/Screens/ChatScreen.cs
+++ b/2D/Screens/ChatScreen.cs
@@ -178,7 +178,7 @@ namespace ClassicalSharp {
 			suppressNextPress = false;
 
 			if( HandlesAllInput ) { // text input bar
-				if( key == Key.Enter ) {
+				if( key == Window.Keys[KeyMapping.SendChat] ) {
 					HandlesAllInput = false;
 					Window.Camera.RegrabMouse();
 					textInput.SendTextInBufferAndReset();
@@ -188,11 +188,11 @@ namespace ClassicalSharp {
 				return true;
 			}
 
-			if( key == Key.T ) {
+			if( key == Window.Keys[KeyMapping.OpenChat] ) {
 				OpenTextInputBar( "" );
 			} else if( key == Key.Slash ) {
 				OpenTextInputBar( "/" );
-			}  else if( key == Key.H ) {
+			}  else if( key == Window.Keys[KeyMapping.ChatHistoryMode] ) {
 				HistoryMode = !HistoryMode;
 				normalChat.Dispose();		
 				InitChat();
diff --git a/2D/Screens/NormalScreen.cs b/2D/Screens/NormalScreen.cs
index 7c44efc60..6f1e1dd42 100644
--- a/2D/Screens/NormalScreen.cs
+++ b/2D/Screens/NormalScreen.cs
@@ -18,7 +18,7 @@ namespace ClassicalSharp {
 			if( playerList != null ) {
 				playerList.Render( delta );
 				// NOTE: Should usually be caught by KeyUp, but just in case.
-				if( !Window.IsKeyDown( Key.Tab ) ) {
+				if( !Window.IsKeyDown( KeyMapping.PlayerList ) ) {
 					playerList.Dispose();
 					playerList = null;
 				}
@@ -61,7 +61,7 @@ namespace ClassicalSharp {
 		}
 		
 		public override bool HandlesKeyDown( Key key ) {
-			if( key == Key.Tab ) {
+			if( key == Window.Keys[KeyMapping.PlayerList] ) {
 				if( playerList == null ) {
 					if( Window.Network.UsingExtPlayerList ) {
 						playerList = new ExtPlayerListWidget( Window );
@@ -78,7 +78,7 @@ namespace ClassicalSharp {
 		}
 		
 		public override bool HandlesKeyUp( Key key ) {
-			if( key == Key.Tab ) {
+			if( key == Window.Keys[KeyMapping.PlayerList] ) {
 				if( playerList != null ) {
 					playerList.Dispose();
 					playerList = null;
diff --git a/2D/Screens/PauseScreen.cs b/2D/Screens/PauseScreen.cs
index 30ad54840..9c53be4ae 100644
--- a/2D/Screens/PauseScreen.cs
+++ b/2D/Screens/PauseScreen.cs
@@ -29,18 +29,28 @@ namespace ClassicalSharp {
 			controlsWidget = CreateTextWidget( 0, 30, "&eControls list", Docking.LeftOrTop, 16, FontStyle.Bold );
 			gameWidget = CreateTextWidget( 0, -60, "&eBack to game", Docking.BottomOrRight, 16, FontStyle.Bold );
 			exitWidget = CreateTextWidget( 0, -10, "&eExit", Docking.BottomOrRight, 16, FontStyle.Bold );
-			MakeKeysLeft( "Forward: W", "Back: S", "Left: A", "Right: D", "Jump: Space", "Respawn: R", "Set spawn: Y", 
-			             "Open chat: T", "Send chat: Enter", "Pause: Escape", "Open inventory: B" );
-			MakeKeysRight( "Take screenshot: F12", "Toggle fullscreen: F11", "Toggle 3rd person camera: F5",
-			              "Toggle VSync: F7", "Change view distance: F6", "Toggle fly: Z", "Speed: Shift",
-			              "Toggle noclip: X", "Fly up: Q", "Fly down: E", "Display player list: Tab" );
+			
+			KeyMapping[] mappingsLeft = { KeyMapping.Forward, KeyMapping.Back, KeyMapping.Left, KeyMapping.Right,
+				KeyMapping.Jump, KeyMapping.Respawn, KeyMapping.SetSpawn, KeyMapping.OpenChat, KeyMapping.SendChat,
+				KeyMapping.PauseOrExit, KeyMapping.OpenInventory };
+			string[] descriptionsLeft = { "Forward", "Back", "Left", "Right", "Jump", "Respawn", "Set spawn",
+				"Open chat", "Send chat", "Pause", "Open inventory" };
+			MakeKeysLeft( mappingsLeft, descriptionsLeft );
+			
+			KeyMapping[] mappingsRight = { KeyMapping.Screenshot, KeyMapping.Fullscreen, KeyMapping.ThirdPersonCamera, 
+				KeyMapping.VSync, KeyMapping.ViewDistance, KeyMapping.Fly, KeyMapping.Speed, KeyMapping.NoClip, 
+				KeyMapping.FlyUp, KeyMapping.FlyDown, KeyMapping.PlayerList };
+			string[] descriptionsRight = { "Take screenshot", "Toggle fullscreen", "Toggle 3rd person camera", "Toggle VSync",
+				"Change view distance", "Toggle fly", "Speed", "Toggle noclip", "Fly up", "Fly down", "Display player list" };
+			MakeKeysRight( mappingsRight, descriptionsRight );
 		}
 		
-		void MakeKeysLeft( params string[] keyBindings ) {
+		void MakeKeysLeft( KeyMapping[] mappings, string[] descriptions ) {
 			int startY = controlsWidget.BottomRight.Y + 10;
-			keysLeft = new TextWidget[keyBindings.Length];
+			keysLeft = new TextWidget[mappings.Length];
 			for( int i = 0; i < keysLeft.Length; i++ ) {
-				TextWidget widget = CreateTextWidget( 0, startY, keyBindings[i], Docking.LeftOrTop, 14, FontStyle.Bold );
+				string text = descriptions[i] + ": " + Window.Keys[mappings[i]];
+				TextWidget widget = CreateTextWidget( 0, startY, text, Docking.LeftOrTop, 14, FontStyle.Bold );
 				widget.XOffset = -widget.Width / 2 - 20;
 				widget.MoveTo( widget.X + widget.XOffset, widget.Y );
 				keysLeft[i] = widget;
@@ -48,11 +58,12 @@ namespace ClassicalSharp {
 			}
 		}
 
-		void MakeKeysRight( params string[] keyBindings ) {
+		void MakeKeysRight( KeyMapping[] mappings, string[] descriptions ) {
 			int startY = controlsWidget.BottomRight.Y + 10;
-			keysRight = new TextWidget[keyBindings.Length];
+			keysRight = new TextWidget[mappings.Length];
 			for( int i = 0; i < keysRight.Length; i++ ) {
-				TextWidget widget = CreateTextWidget( 0, startY, keyBindings[i], Docking.LeftOrTop, 14, FontStyle.Bold );
+				string text = descriptions[i] + ": " + Window.Keys[mappings[i]];
+				TextWidget widget = CreateTextWidget( 0, startY, text, Docking.LeftOrTop, 14, FontStyle.Bold );
 				widget.XOffset = widget.Width / 2 + 20;
 				widget.MoveTo( widget.X + widget.XOffset, widget.Y );
 				keysRight[i] = widget;
diff --git a/Entities/LocalPlayer.cs b/Entities/LocalPlayer.cs
index b261657d5..fe6df83e7 100644
--- a/Entities/LocalPlayer.cs
+++ b/Entities/LocalPlayer.cs
@@ -121,16 +121,15 @@ namespace ClassicalSharp {
 			if( Window.ScreenLockedInput ) {
 				jumping = speeding = flyingUp = flyingDown = false;
 			} else {
-				if( Window.IsKeyDown( Key.W ) ) xMoving -= 0.98f;
-				if( Window.IsKeyDown( Key.S ) ) xMoving += 0.98f;
-				if( Window.IsKeyDown( Key.A ) ) zMoving -= 0.98f;
-				if( Window.IsKeyDown( Key.D ) ) zMoving += 0.98f;
+				if( Window.IsKeyDown( KeyMapping.Forward ) ) xMoving -= 0.98f;
+				if( Window.IsKeyDown( KeyMapping.Back ) ) xMoving += 0.98f;
+				if( Window.IsKeyDown( KeyMapping.Left ) ) zMoving -= 0.98f;
+				if( Window.IsKeyDown( KeyMapping.Right ) ) zMoving += 0.98f;
 
-				jumping = Window.IsKeyDown( Key.Space );
-				bool shiftDown = Window.IsKeyDown( Key.ShiftLeft ) || Window.IsKeyDown( Key.ShiftRight );
-				speeding = CanSpeed && shiftDown;
-				flyingUp = Window.IsKeyDown( Key.Q );
-				flyingDown = Window.IsKeyDown( Key.E );
+				jumping = Window.IsKeyDown( KeyMapping.Jump );
+				speeding = CanSpeed && Window.IsKeyDown( KeyMapping.Speed );
+				flyingUp = Window.IsKeyDown( KeyMapping.FlyUp );
+				flyingDown = Window.IsKeyDown( KeyMapping.FlyDown );
 			}
 		}
 		
@@ -347,14 +346,14 @@ namespace ClassicalSharp {
 		}
 		
 		public bool HandleKeyDown( Key key ) {
-			if( key == Key.R && canRespawn ) {
+			if( key == Window.Keys[KeyMapping.Respawn] && canRespawn ) {
 				LocationUpdate update = LocationUpdate.MakePos( SpawnPoint, false );
 				SetLocation( update, false );
-			} else if( key == Key.Y && canRespawn ) {
+			} else if( key == Window.Keys[KeyMapping.SetSpawn] && canRespawn ) {
 				SpawnPoint = Position;
-			} else if( key == Key.Z && canFly ) {
+			} else if( key == Window.Keys[KeyMapping.Fly] && canFly ) {
 				flying = !flying;
-			} else if( key == Key.X && canNoclip ) {
+			} else if( key == Window.Keys[KeyMapping.NoClip] && canNoclip ) {
 				noClip = !noClip;
 			} else {
 				return false;
diff --git a/Game/Game.InputHandling.cs b/Game/Game.InputHandling.cs
index c5040485e..cb958aa67 100644
--- a/Game/Game.InputHandling.cs
+++ b/Game/Game.InputHandling.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using ClassicalSharp.Particles;
 using OpenTK;
 using OpenTK.Input;
@@ -11,6 +12,11 @@ namespace ClassicalSharp {
 			return Keyboard[key];
 		}
 		
+		public bool IsKeyDown( KeyMapping mapping ) {
+			Key key = Keys[mapping];
+			return Keyboard[key];
+		}
+		
 		public bool IsMousePressed( MouseButton button ) {
 			return Mouse[button];
 		}
@@ -69,21 +75,20 @@ namespace ClassicalSharp {
 		static int[] viewDistances = { 16, 32, 64, 128, 256, 512 };
 		void KeyDownHandler( object sender, KeyboardKeyEventArgs e ) {
 			Key key = e.Key;
-			if( key == Key.F12 ) {
+			if( key == Keys[KeyMapping.Screenshot] ) {
 				screenshotRequested = true;
-			} else if( key == Key.F11 ) {
+			} else if( key == Keys[KeyMapping.Fullscreen] ) {
 				WindowState state = WindowState;
-				if( state == WindowState.Fullscreen ) {
-					WindowState = WindowState.Normal;
-				} else if( state == WindowState.Normal || state == WindowState.Maximized ) {
-					WindowState = WindowState.Fullscreen;
+				if( state != WindowState.Minimized ) {
+					WindowState = state == WindowState.Fullscreen ? 
+						WindowState.Normal : WindowState.Fullscreen;
 				}
-			} else if( key == Key.F5 ) {
+			} else if( key == Keys[KeyMapping.ThirdPersonCamera] ) {
 				bool useThirdPerson = Camera is FirstPersonCamera;
 				SetCamera( useThirdPerson );
-			} else if( key == Key.F7 ) {
+			} else if( key == Keys[KeyMapping.VSync] ) {
 				VSync = VSync == VSyncMode.Off ? VSyncMode.On : VSyncMode.Off;
-			} else if( key == Key.F6 ) {
+			} else if( key == Keys[KeyMapping.ViewDistance] ) {
 				if( ViewDistance >= viewDistances[viewDistances.Length - 1] ) {
 					SetViewDistance( viewDistances[0] );
 				} else {
@@ -95,12 +100,12 @@ namespace ClassicalSharp {
 						}
 					}
 				}
-			} else if( key == Key.Escape && !Map.IsNotLoaded ) {
+			} else if( key == Keys[KeyMapping.PauseOrExit] && !Map.IsNotLoaded ) {
 				if( !( activeScreen is PauseScreen ) ) {
 					SetNewScreen( new PauseScreen( this ) );
 				}
 			} else if( activeScreen == null || !activeScreen.HandlesKeyDown( key ) ) {
-				if( key == Key.B ) {
+				if( key == Keys[KeyMapping.OpenInventory] ) {
 					SetNewScreen( new BlockSelectScreen( this ) );
 				} else {
 					LocalPlayer.HandleKeyDown( key );
@@ -142,5 +147,71 @@ namespace ClassicalSharp {
 		bool CanReplace( byte block ) {
 			return block == 0 || ( !CanPlace[block] && !CanDelete[block] && BlockInfo.IsLiquid( block ) );
 		}
+		
+		public KeyMap Keys = new KeyMap();		
 	}
+	
+	public class KeyMap {
+			
+			public Key this[KeyMapping key] {
+				get { return Keys[(int)key]; }
+				set { Keys[(int)key] = value; }
+			}
+			
+			[Obsolete( "It's better to use the KeyMapping indexer")]
+			public Key this[string key] {
+				get {
+					KeyMapping mapping = (KeyMapping)KeyMapping.Parse( typeof( KeyMapping ), key, true );
+					return Keys[(int)mapping]; 
+				}
+				set { 
+					KeyMapping mapping = (KeyMapping)KeyMapping.Parse( typeof( KeyMapping ), key, true );
+					Keys[(int)mapping] = value;
+				}
+			}
+			
+			Key[] Keys = new Key[] {
+				Key.W, Key.S, Key.A, Key.D, Key.Space, Key.R, Key.Y, Key.T,
+				Key.Enter, Key.Escape, Key.B, Key.F12, Key.F11, Key.F7,
+				Key.F5, Key.F6, Key.Z, Key.LShift, Key.X, Key.Q, Key.E, 
+				Key.Tab, Key.H,
+			};
+			
+			bool IsLockedKey( Key key ) {
+				return key == Key.Escape || ( key >= Key.F1 && key <= Key.F35 );
+			}
+			
+			bool IsReservedKey( Key key ) {
+				return key == Key.Slash || key == Key.BackSpace ||
+					( key >= Key.Insert && key <= Key.End ) || 
+					( key >= Key.Up && key <= Key.Right ) || // chat screen movement
+					( key >= Key.Number0 && key <= Key.Number9 ); // block hotbar
+			}
+			
+			public bool IsKeyOkay( Key key, out string reason ) {
+				if( IsLockedKey( key ) ) {
+					reason = "Given key mapping cannot be changed.";
+					return false;
+				}
+				if( IsReservedKey( key ) ) {
+					reason = "Given key is reserved for gui.";
+					return false;
+				}
+				for( int i = 0; i < Keys.Length; i++ ) {
+				   	if( Keys[i] == key ) {
+				   		reason = "Key is already assigned.";
+				   		return false;
+				   	}
+				}
+				reason = null;
+				return true;
+			}
+		}
+		
+		public enum KeyMapping {
+			Forward, Back, Left, Right, Jump, Respawn, SetSpawn, OpenChat,
+			SendChat, PauseOrExit, OpenInventory, Screenshot, Fullscreen, VSync,
+			ThirdPersonCamera, ViewDistance, Fly, Speed, NoClip, FlyUp, FlyDown, 
+			PlayerList, ChatHistoryMode,
+		}
 }
\ No newline at end of file
diff --git a/MeshBuilders/ChunkMeshBuilderTex2Col4.cs b/MeshBuilders/ChunkMeshBuilderTex2Col4.cs
index f761815a8..a7cf9b652 100644
--- a/MeshBuilders/ChunkMeshBuilderTex2Col4.cs
+++ b/MeshBuilders/ChunkMeshBuilderTex2Col4.cs
@@ -140,7 +140,7 @@ namespace ClassicalSharp {
 			for( int i = 0; i < drawInfoBuffer.Length; i++ ) {
 				DrawInfo1D info = drawInfoBuffer[i];
 				if( info.totalVertices > info.vertices.Length ) {
-					Array.Resize( ref info.vertices, info.totalVertices );
+					info.vertices = new VertexPos3fTex2fCol4b[info.totalVertices];
 				}
 			}
 		}