Fair points. I don't think NG+ runs should be forced to use a particular save, though. Making people use a fixed save is what makes the runs arbitrary. NG+ runs should allow you to use whatever finished save you have.
Edit: I also have no idea how to set up a misc. category, so if someone else wants to do that, that'd be great.
@TheOOT, I made the category myself. There had been discussion in the Discord recently about a NG+ speedrun, and gamebrain had spent some time routing it and discussing things with me about it, so it seemed like there was community interest in it. If I am wrong and the community does not desire this category, sure we can remove it, but I would still want it to be showcased somewhere (unless that's what you mean by a "misc." category).
The title probably can and should be changed to reflect that it's not starting from a fresh file. "Any%" gives that misinterpretation. Bear in mind, however, there are more speedruns than just those that start from a fresh file. NG+ runs are not uncommon, either. Resident Evils 4-6 have New Game+ categories listed alongside New Game, and those games feature carrying over everything you had when you finished the game.
"Following the logic spoken in this thread: I decided I wish to do a LR Easy DLC NG+ run tomorrow. I'll get it added up on the leaderboards because more runs only enlarge and help the community, right?" I mean, I'm all for adding more runs to this site... how is that a negative?