I'll look into a method for you but I do know that as it is actually a mac application and not just a windows game wrapped up with wine. you should be able to (and it does work for me) to switch out of the window via + tab
It's the same as COD2, just hold the Command/Apple key down while you open the game. Then it should give you a window where you can uncheck "Full Screen Mode".
It's the same as COD2, just hold the Command/Apple key down while you open the game. Then it should give you a window where you can uncheck "Full Screen Mode".