I didn't remember most walking transformations (all ?) have a drain speed 1000 effect attached to them, making their animation choppy and you don't actually gain any speed by transforming into them, so these transformations become actually useless... The bat form is great, no speed drain here, you are too fast to be attacked, but creatures run after you and catch up once you turn back in human form ! (it would really be better if you didn't get attacked in this form)
Mind scan / rip is clearly a vampire spell, if you are not a vampire it gets really tricky to steal a spell from an npc, unless you know you'll have to kill this one and he has an interesting spell, so you can try to steal it at the beginning of the fight, otherwise good luck because you'll need to find a way to imprison him 1st or at least make him totally hopeless 1st, but story wise it's quite immersive. Plus these spells require a high illusion level, you'll get this more easily as a vampire.
So in human form these are mostly useless for me now, too bad... !
edit : actually the choppy animation was from an old archive of this mod I had, from 2014, don't remember where it's from, the one linked to this page still has the drain speed 1000 effect, but the animation is smooth and the transformation reacts normally to the run key, so they are useful after all. Now it's really too bad that when you turn into a nix hound you are still attacked by nix hounds, this might be the biggest drawback of this mod after all...