I'm rebinding melee and skill power activation to keys closer to the WASD keys to make them more accessible. I was going to rebind Q, but by default it is set to "Secondary Use".
The only use of that key in-game that I've noticed so far is that it allows you to shop with NPCs instead of just talking to them. Are there any other uses for this key?

drop weaponwas bound to_by default on my install (installed yesterday evening)... – horatio Sep 21 '12 at 18:50