Well I think what this guy means is that you can have any superpower you want, you just are not allowed to use it with malicious intent.
Anywayz, my power would be teleportation. Whenever people say "Oh I want to fly!" I tell them, "Fuck that!". Teleportation cuts out the middleman between places and you can be anywhere instantly. Suddenly long distance relationships are only a matter of perspective. You will never be "too lazy to go pick up the remote". And if you really want the sensation of flying then just teleport straight up, fall for a bit, then when you get bored of it, teleport back to the ground. No harm done, and free skydiving!
Also it would have the potential to get yourself out of any hairy situations you may get into. Don't really consider that a combat use, I consider it a combat AVOIDANCE use.