To be fair, the werewolves do not have human skeletons, they have something between a human skeleton and a dog skeleton, which lets them run on all fours.
Khajiit are a bit more on the human side of the beast ---- human scale.
That said, I'd love to see modders take advantage of the awesome werewolf skeleton and animations we have in order to improve the beast races (both argonians and khajiit). Mainly, digitrigrade legs...
Khajiit legs are to long compared to the arms to run on four legs, also the upper body is to short compared to the legs.
yes it had been cool, however it would require much larger changes than just giving them digtigrade legs, who would only affect boots and bottom of pants.