In another site I'm on, people have the ability to block other members. This is not like ignore- with ignore, you just don't see what an ignored member posts. With this block, they wouldn't be able to post on threads that the blocker creates, as well as not be able to message the blocker.
I have thought of a variation- that is, that this feature would only work in the Clean Debate Zone.
The goal is to separate personalities that clash too much, in the hopes of having less acrimonious discussions.
We experimented with a concept of "Invite Only" threads, where the OPoster gets to SPECIFY a participant list and everyone "not invited" has to obey that. Not many takers, because folks didn't like being driven to discussion by invite or because too many USMB are here to "bait and rumble"..
Concept STILL is part of Structure Debate forum. But, like I said -- it was awkward for an open forum like ours. The Structured Debate forum also has a feature where the OPoster can specify ADDITIONAL RULES to the debate (within reason) above and beyond the USMB rules and policies.
If you are OPoster and trolls are obviously IN NEED of being blocked and violating specific rules as posted in "Posting Guidelines" on the HomePage, file reports.. Mods can push a button and exclude them from thread. If it's chronic offenders in an open thread-- contact a mod VIA PM -- to make the case that they should be thread banned..