Answer by Bunny83

I don't think that's ghosting. CTRL is a pure combination key, so pressing it together with another key is how it's ment to be used. The problem is **that are all hotkeys which are recognised by the Unity Editor** itself. In a build it will work as expected. For testing i recommend to not use the CTRL key in the editor. You can setup another alternate key for crouching. Try press CTRL and S and you will actually get a notification that you can't save the scene while in run-mode. CTRL + D is "duplicate" in the editor CTRL + A is "select all" Unity uses a lot CTRL key ombinations. So avoid modifier keys (CTRL / ALT) completely if possible. Again: In a build all those problems are gone.