Have you ever played Tom Clancy's Endwar? The game is mediocre, but what it pulls off incredibly well is the ability to use voice commands during the game. I would LOVE to see this in Star Trek. Being a Captain, I'd much rather have a more command role, even if there's only a limited set of options.
Some of the greatest moments in Star Trek are when the Captain takes command and does his/her thing by issuing a red alert, telling someone to put the shields up, and generally getting things in order. To be able to actually say "Shields up!" Would be sick!
Also, I think this would greatly assist with the special abilities. Sometimes I"m deeply in a fight reinforcing shields/etc... and I would much rather be able to say "Tactical: High Yield Torpedo" than break my concentration and look for the button.