I mean it's worth noting that both ausar and kaithrit occupy a huge range of biomes across dozens if not hundreds of different inhabited planets.
Also yeah Sphinx Warriors are a kaithrit special forces group.
I mean I literally made the ausar, so I ought to be :P
And no, their feet are fully covered. That's why they gotta wear shoes: can't have dirt and grime building up in the fur!
Yes. They have the same foot structure as humans, just with fur. There's plenty of art of Anno or Syri wearing shoes/stockings/boots.
Yep. I don't think pads are ever mentioned one way or the other; I imagine they don't, personally, but I'm not picky about how artists depict them.
Nothing, that's the point.
No, it's an alternate way to get Amazon Reaha. Whether you use the Treatment or Holstaria, you get (basically) the same thing.
Yeah I had some notes about the physical TFs Reaha gets when she changes; see above.