It would've helped yourself if you actually pointed that out in your first post.
In fact it would've been an idea to say what your OS is at all, either way...
There's also for Linux:
Alt+Escape; Alternative for Alt-tab that doesn't give a list, but swaps instantly, guessing it won't work for you, but it could.
Alt+F9; Minimizes the game, (GNOME only)
Ctrl+Alt+D; Shows desktop
Alt+F1; Accesses applications, not sure if this'll help, thought I'd point it out anyway.
Ctrl+Esc; Again, though opens your task manager this time. (KDE)
Also, pretty much all I'm getting for the Mac is F11 and Cmd+M or Cmd+H, there's also the Mac's version of alt-tab which is Cmd+Tab.
Further than that I don't think I can help you guys.