As title, Either FS/FT threads that are their own, or ones in Misc.
Or the ability to ban cirtain members from posting in their thread?
Would relieve a lot of work from "forum helpers" and Moderators..
Obviously this could not be used as a method to attack anyone, and if the OP is using these privileges to do so then they definatly deserve to be suspended then banned for further abuse of that privilege. (ie: ban someone from posting in thread then insult them etc.) hense why the ability to delete unwanted posts in the OPs thread may be the better option, though for those that keep posting/trolling banning them from the thread would serve better purpose..
Again, abuse of this privilege in FS/FT for removing relevant posts from a sale/trade etc would result in a report being made for a mod to look into.
But I think overall this ability would go down well and the majority will not abuse it but use it to keep out people that just troll etc.