Since SuperLemmini is still used by several members of the community, and there appears to be growing interest in it recently, perhaps it could have its own board, like NeoLemmix and Lix do?
This would make finding packs for it a lot easier, for one thing. Also, the "other engines" it's currently lumped in with are mostly defunct ones like Vanilla Lemmix, Lemmings 2, etc.
At the moment, I could understand not wanting to give SuperLemmini its own board, since Tsyu has not been active for a while and although updates and additional features (such as a level editor) have been promised, they do not yet exist. As and when they appear though, I'd say it's definitely worth letting it stand out as a currently-maintained, currently-used platform, for which custom user content is still being created, played, and discussed.