Well... that is something I want to have myself but I don't know too. When gaming, the mouse cursor is usually gone when the gaming screen is active in full screen & the only way to make it re-appear is to "Alt"+"tab". But that is cumbersome at the least.
Sorry I can not help at the moment but I am also interested in finding the answer to your question. Let us see if someone who knows comes to this thread.
By the way, have you tried Windows+"tab" or "alt"+"tab" while gaming? I do not have a PC game installed in my laptop so I just run ppt on slide show & tried it. It seems I can swap windows on my second monitor that way but I do not know if it works while the game is in full screen.