Do you think there would be any interest in routeing a 100% all side quest run? Would it be something that anyone else would be interested in learning. In actually new and getting ready to use all your guides to learn this game and wondered if this could be a category as well.
So far it hasn't gathered any interest. You're certainly welcome to. Right now the closest thing we've agreed on for a category similar to that is All Confessions/Quests, it's under the misc tab as no one has bothered putting serious work into it.
You're certainly welcome to make any rule set you would like for a particular run you're interested in. However not all categories will be listed on the leader board until the community agrees on them being listed.
It would be cool seeing all of the characters be used in some of the boss fights, but somehow I feel like the bosses will be fought in almost exactly the same way. Rubella's Plight and Gen's Plight are good examples of this. On the way to Griffin we would simply move over to Tristis and skip his text like we did with Rubella, and with Gen we just wouldn't enter the Temple of the Sun immediately. We would instead fly back to her quickly and skip through her text as well. Making another category makes sense when you look at it, I feel as though the run will end up very similar but will require occasional 30 second or so detours that only slightly deviate from the main route, so it will end up being essentially a slower Any% rather than a unique run. I'm in favor of making the category regardless, but it will be hard to generate interest in running it.
All quests would require you to actually complete Finn's/Oengus' quest that we end up skipping. Additionally, you'd have to do that side-quests from a few NPCs as well.
It does seem like it would end up being the same as Any%, with just going out of your way at a few points. Tristis isn't particularly great, and we don't get Gen long enough for her to be used IMO. But whoever would like to route that out and see, feel free to go ahead!