I was thinking maybe it would be a good idea if you could ban certain people from posting in your own self-moderated threads. Would save people deleting posts from persistent trolls.
Yes, please implement this. The only privilege to a self-moderated thread is deleting posts. You can't edit other people's posts (which is understandable), move posts, or ban a user from the thread. Deleting posts from trolls is pointless because they'll just keep posting the same deleted post again.
On top of that, the self-moderated thread creator should be able to set a minimum activity level to post in the thread (so to stop people registering new accounts to post in it).