Just like to say I totally agree with checksix's points - I do quite a bit of LAN gaming and most of the players around here have a hard enough time managing to bind a "press to talk" button, never mind learning how to switch channels... Without being able to remotely switch such players onto the correct channel before a game starts there's no way to ensure the enemy isn't listening in on your conversation without kicking players.
Please oh please oh please oh please let admins switch users between channels because no-one here will use voice chat anymore because of the reasons mentioned above and there's a plethora of headset microphones gathering dust and some very disjointed Battlefield 1942 games going on...