No clue if this is possible without huge overhaul.

But have a filter where you could add their user id, to keep them from flaming or posting spam in your thread if you've encountered them before.

Also would have to set tiers to allow Members++ and up to go around this block.


Maybe a terrible suggestion...maybe not..but would be a nice feature to keep folks out that you don't want in.

If a user spam your topic, report it and move on.
if he pm you, you can block him.
If he spam each and every topic you do, gather all the information and report to the staff member who led that subforum.