Also a Hero + Board similar to VIP might be in the same type of category, unless you meant to just exclude newbies in certain threads.
I've thought about something like this before. Maybe a special sub for just Hero or Legendary or something.
TBH, I don't have any interest in Hero+ boards. What would we discuss in Hero+ sections that couldn't/shouldn't be discussed in normal subs ? Afraid it would devolve into a circle-jerk.
I understand the option could be abused, but I've see far more abuse with self-moderated posts, and this cowardly post-locking shit Leroy Fodor is pulling.
The code for this feature is trivial, and believe it's at least worthy of experimentation.
I would further suggest that allowing Minimum Rank threads should be mutually exclusive of the option to have a Self Moderated thread.