How about giving the OP the option to ban someone from posting on their thread? And/or ability to delete unwanted posts. By giving the OP the ability to manage the content of their own threads it should lessen the burden on ET administration to deal with trolls. I'm sure there are many threads where OPs have stopped posting due to unwanted content. The only downside I can see to this is that some people would be banned from posting for wrong reasons, perhaps simply stating an opposing view to the OP....but is this really a bad thing? If content is not wanted by the OP, it would be nice to be allowed to restrict it.