diff --git a/src/i_video.c b/src/i_video.c
index 7ec8cb4b..93f5ed8e 100644
--- a/src/i_video.c
+++ b/src/i_video.c
@@ -760,17 +760,21 @@ void I_GetEvent(void)
 // This is to combine all mouse movement for a tic into one mouse
 // motion event.
 
+// The mouse input values are input directly to the game, but when
+// the values exceed the value of mouse_threshold, they are multiplied
+// by mouse_acceleration to increase the speed.
+
 int mouse_acceleration;
-int mouse_threshold; // 10;
+int mouse_acceleration_threshold;
 
 static int AccelerateMouse(int val)
 {
     if (val < 0)
         return -AccelerateMouse(-val);
 
-    if (val > mouse_threshold)
+    if (val > mouse_acceleration_threshold)
     {
-        return (val - mouse_threshold) * mouse_acceleration / 100 + mouse_threshold;
+        return (val - mouse_acceleration_threshold) * (mouse_acceleration + 10) / 10 + mouse_acceleration_threshold;
     }
     else
     {
diff --git a/src/m_menu.c b/src/m_menu.c
index 5206cd33..90dcceb1 100644
--- a/src/m_menu.c
+++ b/src/m_menu.c
@@ -138,7 +138,7 @@ background_t menu_background;
 #define M_X_NEXT     (310)
 #define M_Y_PREVNEXT (29 + 18 * M_SPC)
 #define M_Y_WARN     (M_Y_PREVNEXT - M_SPC)
-#define M_THRM_SIZE  13
+#define M_THRM_SIZE  10
 #define M_THRM_STEP  8
 #define M_THRM_WIDTH (M_THRM_STEP * (M_THRM_SIZE + 2))
 #define M_X_THRM     (M_X - M_THRM_WIDTH)
@@ -2210,23 +2210,23 @@ static void M_DrawMiniThermo(int x, int y, int size, int dot, char *color)
 {
   int xx;
   int  i;
-  const int step = M_THRM_STEP * M_THRM_SIZE / size;
+  const int step = M_THRM_STEP * M_THRM_SIZE * FRACUNIT / size;
 
   xx = x;
-  V_DrawPatchTranslated(xx, y, 0, W_CacheLumpName("M_MTHRML", PU_CACHE), color);
+  V_DrawPatch(xx, y, 0, W_CacheLumpName("M_MTHRML", PU_CACHE));
   xx += M_THRM_STEP;
   for (i = 0; i < M_THRM_SIZE; i++)
   {
-    V_DrawPatchTranslated(xx, y, 0, W_CacheLumpName("M_MTHRMM", PU_CACHE), color);
+    V_DrawPatch(xx, y, 0, W_CacheLumpName("M_MTHRMM", PU_CACHE));
     xx += M_THRM_STEP;
   }
-  V_DrawPatchTranslated(xx, y, 0, W_CacheLumpName("M_MTHRMR", PU_CACHE), color);
+  V_DrawPatch(xx, y, 0, W_CacheLumpName("M_MTHRMR", PU_CACHE));
 
   // [FG] do not crash anymore if value exceeds thermometer range
   if (dot > size)
       dot = size;
 
-  V_DrawPatchTranslated(x + M_THRM_STEP / 2 + dot * step, y, 0,
+  V_DrawPatchTranslated(x + M_THRM_STEP / 2 + dot * step / FRACUNIT, y, 0,
                         W_CacheLumpName("M_MTHRMO", PU_CACHE), color);
 }
 
@@ -2481,7 +2481,7 @@ void M_DrawSetting(setup_menu_t* s)
       const int max = s->var.def->limit.max;
       const int offsetx = SHORT(hu_font[0]->width);
       const int offsety = (M_SPC - SHORT(hu_font[0]->height)) / 2;
-      const int size = (max == UL ? M_THRM_SIZE : max);
+      const int size = (max == UL ? M_THRM_SIZE * 2 : max);
 
       M_DrawMiniThermo(x - offsetx, y - offsety, size, value,
                        ItemDisabled(flags) ? cr_dark : colrngs[color]);
@@ -4073,6 +4073,8 @@ enum {
   gen4_mouse1,
   gen4_mouse2,
   gen4_mouse3,
+  gen4_mouse_accel,
+  gen4_mouse_accel_threshold,
   gen4_end1,
 
   gen4_title2,
@@ -4083,6 +4085,25 @@ enum {
   gen4_end2,
 };
 
+#define MOUSE_ACCEL_STRINGS_SIZE (40 + 2)
+
+static const char *mouse_accel_strings[MOUSE_ACCEL_STRINGS_SIZE];
+
+static void M_InitMouseAccel(void)
+{
+  int i;
+  char buf[8];
+
+  for (i = 0; i < MOUSE_ACCEL_STRINGS_SIZE - 1; ++i)
+  {
+    int val = i + 10;
+    M_snprintf(buf, sizeof(buf), "%1d.%1d", val / 10, val % 10);
+    mouse_accel_strings[i] = M_StringDuplicate(buf);
+  }
+
+  mouse_accel_strings[i] = NULL;
+}
+
 void M_ResetTimeScale(void)
 {
   if (strictmode || D_CheckNetConnect())
@@ -4258,6 +4279,12 @@ setup_menu_t gen_settings4[] = { // General Settings screen4
   {"Invert vertical axis", S_YESNO, m_null, M_X,
    M_Y+ gen4_mouse3*M_SPC, {"mouse_y_invert"}},
 
+  {"Mouse acceleration", S_THERMO, m_null, M_X_THRM,
+   M_Y + gen4_mouse_accel * M_SPC, {"mouse_acceleration"}, 0, NULL, mouse_accel_strings},
+
+  {"Mouse threshold", S_NUM, m_null, M_X,
+   M_Y + gen4_mouse_accel_threshold * M_SPC, {"mouse_acceleration_threshold"}},
+
   {"", S_SKIP, m_null, M_X, M_Y + gen4_end1*M_SPC},
 
   {"Miscellaneous"  ,S_SKIP|S_TITLE, m_null, M_X, M_Y + gen4_title2*M_SPC},
@@ -7085,6 +7112,8 @@ void M_Init(void)
       break;
     }
 
+  M_InitMouseAccel();
+
   M_ResetMenu();        // killough 10/98
   M_ResetSetupMenu();
   M_InitHelpScreen();   // init the help screen       // phares 4/08/98
diff --git a/src/m_misc.c b/src/m_misc.c
index 9f937e29..73263b91 100644
--- a/src/m_misc.c
+++ b/src/m_misc.c
@@ -83,7 +83,7 @@ extern int grabmouse;
 extern boolean flipcorpses; // [crispy] randomly flip corpse, blood and death animation sprites
 extern boolean ghost_monsters; // [crispy] resurrected pools of gore ("ghost monsters") are translucent
 extern int mouse_acceleration;
-extern int mouse_threshold;
+extern int mouse_acceleration_threshold;
 extern int show_endoom;
 #if defined(HAVE_FLUIDSYNTH)
 extern char *soundfont_path;
@@ -2058,16 +2058,16 @@ default_t defaults[] = {
   },
 
   {
-    "cfg_mouse_acceleration",
+    "mouse_acceleration",
     (config_t *) &mouse_acceleration, NULL,
-    {100}, {100,UL}, number, ss_none, wad_no,
-    "adjust mouse acceleration (100 = no acceleration)"
+    {10}, {0,40}, number, ss_none, wad_no,
+    "adjust mouse acceleration (0 = 1.0, 40 = 5.0)"
   },
 
   {
-    "mouse_threshold",
-    (config_t *) &mouse_threshold, NULL,
-    {0}, {0,UL}, number, ss_none, wad_no,
+    "mouse_acceleration_threshold",
+    (config_t *) &mouse_acceleration_threshold, NULL,
+    {10}, {0,32}, number, ss_none, wad_no,
     "adjust mouse acceleration threshold"
   },