It's a very fun mods, but it has a few quirks that make it unpleasant to use (stuttering when changing packs, "levitating" when changing any parameter, to name a few)
Also when I tried making my own pack, the game crashed... (and now I can't delete this pack or modify it)
Also (less important but still)
I tried using this mod with ITEMBOUND (a resource pack with custom models/texture depending on item name) and MoBend seems to override the elytra texture and model so the pack doesn't work (I don't see why since we can't animate the elytra, I don't think?), think you could make it compatible?