Unfortunately, no. As far as I've known, the Tremulous devs has not created a manual function that could disable weapons in the game. QVM Developers has easily managed to do this, like doing this: "!disable hendrich lgun" just like how a player runs out of ammo for a weapon and such. To which exact .Qvm does this function has, I do not know. I've only seen this in a clan server, unfortunately.