This was my main question; I probably could have been clearer. Where does it say that one hand is consumed in maintaining the grab? That makes sense, but from my reading, all you have to do is stay next to the guy, spend a minor action to maintain, and succeed on subsequent escape attempts. Otherwise you're free to do whatever you want.
You must have at least one hand free to make a grab attempt.
This does not explicitly state that one needs to keep using that hand to maintain the grab, that is a common sense inference.
Just like holding a weapon does not state that you have to use a hand to continue using it.
As to the "can I use a power while maintaining a grab", why not?
Sustaining a grab is a minor action, no different than any other minor action.
So yes, a PC Wizard could grab someone and then blast them with a Power, all in the same round if he used an Action Point.
The thing about Grab is that it is so easy to Escape that it's typically not worth it.
Any creature (even PCs) that has Skill Training in Acrobatics or Athletics typically also has a decent ability score to go with it. So, the chances of Escaping from a Grab for those types of creatures against same level opponents is typically > 70% (a mathematical flaw in the game system, the creature escaping gets a +5 for Skill Training that the defense does not have).
The only creatures worth grabbing are ones not Skill Trained in Acrobatics or Athletics like most PC Wizards.
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