Ahh, I see what you're saying.  It's MAME's fault it is recognizing the other controllers.
 
	In that case, I'll leave Start/Select as the hotkeys for Bigbox (because other emulators won't have an issue with it), and I'll remap Coin/Start in MAME to the sticks.   Since the sticks aren't used in MAME, that should solve the problem.