There is already a feedback for this idea, as the other has more likes on it, I will close this one down and ask that you go to the other for this idea :) 

If there is a troll or bad behaviour in chat, you can always contact a member of the staff team or prefect team, or even an AT - there are a few choices who can help out straight away. It is just as easy to look up on the map to see who is around. Also quite a lot of the time the staff are dealing with it, just maybe have not come into chat yet :)