A more realistic idea (what I think the grandparent was suggesting) it just to try to filter off discussions not strictly related to rationality (HPMOR; fiction threads; the AGI/​SIAI discussions; etc) into the discussion forum, and to stick stuff strictly related to rationality (or relevant paper-sharing, or whatever) in another subreddit.
A more realistic idea (what I think the grandparent was suggesting) it just to try to filter off discussions not strictly related to rationality (HPMOR; fiction threads; the AGI/​SIAI discussions; etc) into the discussion forum, and to stick stuff strictly related to rationality (or relevant paper-sharing, or whatever) in another subreddit.