It's great, but it actually also gives Luigi his backflip spin. Now, this is actually an upgrade, except for 1 pretty big issue: sometimes, Luigi just freezes when he lands. No buttons make him move, and switching characters doesn't help either. It can be pretty infuriating to have all your progress thrown away for no particular reason and brings something that is otherwise a pure upgrade to the base game down to something that you may want to stay away from lest risk what is essentially killing yourself. Otherwise, though, this is great and the animations themselves are just a neat bit of charm (but I'd advertize the movesets more, as that's really where the money's at)
About the v3.25 jump animation, I don't have access to that, unless if I can find where to find the models outside of the `.bin` file since `.bin` is not possible to edit without the original source of the model.
I don't know what exactly you mean by "supports 'Character Select'", but if you mean support for other characters too and not just base game, I can try that, but there's no guarantee.