It will work, but you need to find or write a game that uses MM controls
It's probably possible, but you'd need to write the game yourself. Also, the mouse wouldn't be able to control the computer, so the game should be able to respecify mouse button actions and controls. It also needs to be optimized for the magic mouse. I'm not sure if the mouse differentiates from the top and bottom of the mouse for expose, but if it does, it will work flawlessly. Its just a matter of finding or writing a game that uses the magic mouse controls differently to control the game.