I think clays should stay. Idrizi is right, there is promod for ppl who dont like perks. everyone has a weapon/perk he doesnt like. I for example hate p90, because it's simply too fast and you dont really need to aim with it.
But if you know that there's a guy with a p90 running around like a headless chicken, one can adapt his gameplay. same goes for clays. too many rules will bring players to look for another server. the last server i played on even went so far and banned dead silence.
just my two cents.