We do, it's this thread, http://www.arrse.co.uk/arrse-hole/105655-c0cks-nobbers.html , though tbf, it has somewhat fallen into disuse since being moved to the Arrse Hole, after some exquisite dummy-spitting on the part of some posters, and people have forgotten it. It worked quite well, nominate the chopper in question and the reasons why and if your your nomination gets supported by others they got O2'ed. Worked on Oli_Slick/Semper and Tekirdag amongst others.
So if you feel someone deserves nomination do it.
No I'm not talking about a place where mud is slung and personal grievances aired- the 'Rogues Gallery' or 'Sin Bin' wouldn't be open for comment. Only mods would have access and only the bare facts would be listed. Each post could be titled with the miscreants user name and 'sentence' and the offending post repeated within, maybe with a brief comment from the mod concerned if it was thought necessary.