diff --git a/includes/defines.h b/includes/defines.h
index 1a9b1e9ec..3d5c4bf03 100644
--- a/includes/defines.h
+++ b/includes/defines.h
@@ -166,6 +166,7 @@ extern int active_menu;
 extern int hud_enable;
 extern int pretty_powder;
 extern int drawgrav_enable;
+extern int ngrav_enable;
 int limitFPS;
 int water_equal_test;
 extern int quickoptions_tooltip_fade;
diff --git a/includes/interface.h b/includes/interface.h
index 6eb6647b3..2c1a2900a 100644
--- a/includes/interface.h
+++ b/includes/interface.h
@@ -77,6 +77,8 @@ static quick_option quickmenu[] =
 	{"P", "Sand effect", QM_TOGGLE, &pretty_powder},
 	{"G", "Draw gravity grid", QM_TOGGLE, &drawgrav_enable},
 	{"D", "Show decorations", QM_TOGGLE, &decorations_enable},
+	{"N", "Newtonian gravity", QM_TOGGLE, &ngrav_enable},
+	{"A", "Ambient heat", QM_TOGGLE, &aheat_enable},
 	{NULL}
 };
 
diff --git a/src/graphics.c b/src/graphics.c
index 080cb2a9d..cf5a76037 100644
--- a/src/graphics.c
+++ b/src/graphics.c
@@ -1314,14 +1314,19 @@ void draw_air(pixel *vid)
 					clamp_flt(pv[y][x], 0.0f, 8.0f),//pressure adds green
 					clamp_flt(fabsf(vy[y][x]), 0.0f, 8.0f));//vy adds blue
 			}
-			else if (display_mode & DISPLAY_AIRH)
+			else if ((display_mode & DISPLAY_AIRH))
 			{
-				float ttemp = hv[y][x]+(-MIN_TEMP);
-				int caddress = restrict_flt((int)( restrict_flt(ttemp, 0.0f, MAX_TEMP+(-MIN_TEMP)) / ((MAX_TEMP+(-MIN_TEMP))/1024) ) *3, 0.0f, (1024.0f*3)-3);
-				c = PIXRGB((int)((unsigned char)color_data[caddress]*0.7f), (int)((unsigned char)color_data[caddress+1]*0.7f), (int)((unsigned char)color_data[caddress+2]*0.7f));
-				//c  = PIXRGB(clamp_flt(fabsf(vx[y][x]), 0.0f, 8.0f),//vx adds red
-				//	clamp_flt(hv[y][x], 0.0f, 1600.0f),//heat adds green
-				//	clamp_flt(fabsf(vy[y][x]), 0.0f, 8.0f));//vy adds blue
+				if (aheat_enable)
+				{
+					float ttemp = hv[y][x]+(-MIN_TEMP);
+					int caddress = restrict_flt((int)( restrict_flt(ttemp, 0.0f, MAX_TEMP+(-MIN_TEMP)) / ((MAX_TEMP+(-MIN_TEMP))/1024) ) *3, 0.0f, (1024.0f*3)-3);
+					c = PIXRGB((int)((unsigned char)color_data[caddress]*0.7f), (int)((unsigned char)color_data[caddress+1]*0.7f), (int)((unsigned char)color_data[caddress+2]*0.7f));
+					//c  = PIXRGB(clamp_flt(fabsf(vx[y][x]), 0.0f, 8.0f),//vx adds red
+					//	clamp_flt(hv[y][x], 0.0f, 1600.0f),//heat adds green
+					//	clamp_flt(fabsf(vy[y][x]), 0.0f, 8.0f));//vy adds blue
+				}
+				else
+					c = PIXRGB(0,0,0);
 			}
 			else if (display_mode & DISPLAY_AIRC)
 			{
diff --git a/src/interface.c b/src/interface.c
index 4badd0c1c..eede146e2 100644
--- a/src/interface.c
+++ b/src/interface.c
@@ -2621,7 +2621,15 @@ void quickoptions_menu(pixel *vid_buf, int b, int bq, int x, int y)
 				quickoptions_tooltip_y = (i*16)+5;
 				if(b && !bq)
 				{
-					*(quickmenu[i].variable) = !(*(quickmenu[i].variable));
+					if (!strcmp(quickmenu[i].name,"Newtonian gravity"))
+					{
+						if(!ngrav_enable)
+							start_grav_async();
+						else
+							stop_grav_async();
+					}
+					else
+						*(quickmenu[i].variable) = !(*(quickmenu[i].variable));
 				}
 			}
 		}
@@ -2886,6 +2894,11 @@ void set_cmode(int cm) // sets to given view mode
 	{
 		colour_mode = COLOUR_HEAT;
 		strcpy(itc_msg, "Heat Display");
+		free(display_modes);
+		display_modes = calloc(2, sizeof(unsigned int));
+		display_mode |= DISPLAY_AIRH;
+		display_modes[0] = DISPLAY_AIRH;
+		display_modes[1] = 0;
 	}
 	else if (cmode==CM_FANCY)
 	{
diff --git a/src/main.c b/src/main.c
index 9d5d8472a..0f70de4a2 100644
--- a/src/main.c
+++ b/src/main.c
@@ -2227,7 +2227,7 @@ int main(int argc, char *argv[])
 					}
 					if (x>=(XRES+BARSIZE-(510-476)) && x<=(XRES+BARSIZE-(510-491)) && !bq)
 					{
-						render_ui(vid_buf, XRES+BARSIZE-(510-491), YRES+(MENUSIZE-19), 3);
+						render_ui(vid_buf, XRES+BARSIZE-(510-491), YRES-2, 3);
 					}
 					if (x>=(XRES+BARSIZE-(510-494)) && x<=(XRES+BARSIZE-(510-509)) && !bq)
 						sys_pause = !sys_pause;