We’re not doing formal subfora at least at this time. I don’t think we ever would bother.
breaking-news is effectively a sub-forum of MPSIMS. If a need really arose we could add another tag.
The MMP are effectively tagged the old fashion way: https://boards.straightdope.com/search?q=MMP%20%23mundane-pointless-stuff-i-must-share-mpsims
Most of Beck’s stuff also: https://boards.straightdope.com/search?q=Bad%20bad%20bad%20%23mundane-pointless-stuff-i-must-share-mpsims
Then we sadly have the RIP threads but they’re indexed in
Then there is everything else.