One is if anyone has precog that is strictly under the gm's control, not the players. The others it may be needed to outline what is allowed, what is possible and what is not possible. For Telekinesis, shoving and pulling small objects only, people, cars, trains, buildings, Enabling yourself to fly?, only external, can't effect yourself, ect,
For healing, is healing instant, does it take time, ect. For telepathy what sorts of things can one do, and not do, limits, ect.
What are the limits for each, at least roughly and maybe at the beginning the limits may be less then later on once you say folks have enough experience so their new limits are xxx.
Also power level could be different from skill level. One may have high power but not be able to do much, low or mid power but have superb skill so they can do amazing things even if their power level is low. It makes sense, to me at least, that power level and skill level could be 2 different things.
Just a few ideas. I guess it'd be humans?