Actually no. It was another custom request mod that I thought maybe someone else would use so I released it. It had two options: Restrict Im posting/viewing by post count, or restrict Im posting but allow viewing by post count. You could disable both of these. I'd just ammend the extra option on there for the sig, which could also be disabled. And I could also look into the guest thing - haven't really done much with guest permissions besides totally blocking them from areas before - could be interesting. Perhaps I should gather up some ideas for a few post based restrictions and then compile them all into the one mod. If you have a few more post based things you think would be nice, feel free to post them here, and I'll start digging around the code after work.
Methonis
Btw, mod can be found here for the im thing:
http://www.yabbse.org/community/index.php?thread=24657