I dunno sounds kinda lame. I think mixing voice commands with normal controls is a better idea. Such as in Unreal Tournament 2004 how you can set it up to use voice commands to control your bots while playing in single player mode.
Yeah, I think you need a mix because if it doesn't understand you you'll be there all day.
Rainbow Six 3 is like that too, there's a mix. You can issue voice commands or commands via the controller.
Yeah I know the idea is rather wierd in my opinion. Not something I think I would be interested. Half the fun of games is all the button pressing. lol