I love this because it makes waterbenders more effective on land and not forced to stay in water. They only thing i think you could change is the flight speed, it shoud be the same as the water spout flight speed.
It's a really nice idea and well-made ability. Sometimes when I select a water source, though, it removes that water block and it doesn't regenerate. It would be nice if it didn't remove water blocks, but this might just be because I'm using a newer version of PK.