G is far too close to the other keys you need, especially if you're a Spy who needs to rely heavily on the "last disguise" key (B). I've never been more humiliated than when I stabbed an enemy Sniper on a 2fort battlement, then tried to go back to my old disguise, only to engage in a long and unexitable taunt, giving an incoming enemy Medic all the time he needed to kill me with his syringegun.
As of now, I have "taunt" bound to my P key.
