Does that count as a movement skill?

Taking damage from something is no excuse not to go fast. This is why it's always appropriate to jump down from any height, since you save a lot of move actions.
Falling Damage? What's that, can I eat it?

Done right, falling isn't just a great way to move fast, it's a great way to inflict damage on others! Thanks Isaac Newton!

just land on your enemies, ez

It helps that the fixed falling damage isn't really capable of keeping up with rapidly inflating health pools, so at around midlevels you can just ignore staircases forever pretty much. So long as people aren't around to aoo your prone ass out of existence, you'll be fine.