i'm tired of my threads getting closed because somebody else posts a bunch of spam in it, how about having a way to block certain users from posting in your threads.. example, i have 1 guy that keeps spamming almost every thread i make till it gets closed, i report him, and MY thread gets closed kinda stupid if you ask me

Blocking other people from posting in your thread has already been suggested.
It won't happen.

If you have the Greesemonkey add-on, there's a script to block user's posts already, i don't have the link.