Hmm. Personally I'm not entirely comfortable with outright increasing the amount of power pools - the main aim here was to allow for a thematic travel power if wished for without 'giving up' on other pools (compare say a Superman-like character who'd prefer the Fly power pool, who can gain the Hover power without taking up another pool, compared to a Doctor Strange-like character who might want Mystic Flight, who can't do the same).
Essentially, I was aiming for an increase in thematic enjoyment without having to make arbitrary sacrifices depending on the theme chosen by a user, with the added concern of avoiding power creep.