1) any distance if its a non-shooting power. 6" if it's a shooting power, as it counts as shooting a weapon.Hey heresy, just a couple of clarifications.
How far could you drive a regular rhino and use a psychic ability. How about a shooting psychic ability?
Can you use a force weapon in your opponents turn if you cast a psychic ability during your turn?
2) yes. You may use 1 psychic power per turn. In the beginning of the book (forget page no.), it explains that "turn" means "player turn", except where specified. So you get one power per player turn, which means one power in both your turn and your opponents turn.
Hope that helps