You'd want a mix of voice + motion. Voice control was demonstrated reasonably competently in Tom Clancy's Endwar.
Endwar was terrible, everything was at a snails pace, as said before, something that requires mirco management DOW2 or grand scale games like SupComm wouldn't work with that tech. I can imagine using your right hand to issue orders and build queues and left hand for camera movement, But then you get the problem are keyboard shortcuts not being used, thus slowing the game down.
how on earth would that gimmick work in games like DoW 2 or supreme commander type games....
or, imagine trying to control your army in SC2 with that crap....
I'm not a game designer you silly tit i just threw the idea out there chill the fuck out.