Add the ability to ignore the user's mouse movement.

osu.Game.Rulesets.Osu/OsuInputManager.cs

@@ -18,6 +18,8 @@ public bool AllowUserPresses
             set => ((OsuKeyBindingContainer)KeyBindingContainer).AllowUserPresses = value;
         }
 
+        public bool AllowUserCursorMovement { get; set; } = true;
+
         protected override RulesetKeyBindingContainer CreateKeyBindingContainer(RulesetInfo ruleset, int variant, SimultaneousBindingMode unique)
             => new OsuKeyBindingContainer(ruleset, variant, unique);
 
@@ -26,6 +28,16 @@ public OsuInputManager(RulesetInfo ruleset)
         {
         }
 
+        protected override bool Handle(UIEvent e)
+        {
+            if (!AllowUserCursorMovement && e is MouseMoveEvent)
+            {
+                return false;
+            }
+
+            return base.Handle(e);
+        }
+
         private class OsuKeyBindingContainer : RulesetKeyBindingContainer
         {
             public bool AllowUserPresses = true;