The host should be able to ban supples, tracers, shield, jet pack. Im sure this has been suggested before. It will be like an anti noob/troll mode. Also I think if you use tracer, some animation visible to everyone should happen.
i'm not sure if this will go out, but i think that the use of tracer really should be visible to other players just like the use of other items
I remember playing against some newbie. He started moaning about the amount of Tracers I was "using". It was just simple arcing, no tracers used since I was a newbie. For this reason, I approve.