[quote=Shienvien]
@Tick: People are speaking about blocklists for specific threads only - you can only keep people posting in a thread you started, they will still be ale to post everywhere else -, not forumwide bans.
[/quote]

It's only for specific threads, but any OP'er in any thread throughout the entire forum can do it. Which is what I refer to when I say "forum-wide." 
Apologies if that's off.