Smokes could be a good or bad idea, today I saw a noob get officer and put arty fire on the only obj we had left to capture, so nobody could get to it.... so maybe if a noob got officer and had smoke grenades many things could happen... like smoking a room then running in and just shooting everywhere until everything in there is dead, and if there are multiple people in the room and it gets smoked then they would prolly freak out and tk everyone around, or not want to fire for fear of tk and be completely destroyed, but it could be really good for strategy (throw a smoke then throw a grenade and they wont see or hear it) [smoke is usually loud]
but if you do this idea, I think you should make differnt color smoke grenades, like russians have red, and germans have blue or yellowish (that could take off from the realism? but atleast they'd know if they were being smoked by a teamate and not to open fire....?) I dno, but thats my input