Had considered this for a PC in development, but nixed it b/c I spent my points building the basic concept, and it was low on the list of powers I wanted - and I couldn't figure out how to make it happen!
I'm basically looking for a power that would allow it's owner to use a Ready or Concentrate maneuver and "lock" himself in place for a short time - Huge bonuses vs. knockback and being moved by outside forces, and if he found himself falling, he could literally stop himself in midair (not maneuver, but just hover in place). Basically he thinks "stop", and stops himself from moving, either until he thinks "go" (or the equiv.), or time runs out.
I had considered a variation on Binding, with some sort of limitation to be self only, requires concentration, persistent(?)... That might add STR against knockback, etc, depending on GM fiat - and might need an additional enhancement to work for the falling through midair problem - but it seems the initial intent is as an attack to immobilize others, which seems like a different concept. (And yes, I know there would be other problems, too - not being able to change facing (minor issue), and with the limitations listed, not being able to turn it off before the persistent time ran out...)