I have Shift and Control bound to the thumb keys on my mouse (a Logitech G9).
When I use the thumb stick on the G13 pad, only my main moves. If I use Shift+Stick, only the alts moves. If I use Control+Stick, everybody moves. I find it to work quite well, especially when "driving" from the tank character.
Whatever character moves, I have 4 fingers free for action on the G-keys of the pad.
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