Oooh! Another thought: Restrictions! These would be for crunchier systems with scales of mass, speed, etc. on the Impact Chart. A Restriction would LOWER the Impact for certain things ...
For instance, Getta Grip might start with a restriction: may only affect items within Average range. This would mean her FX would all have to be up-close; no changing the friction of a meteor on it's way towards Gigacity, for instance!