Ok so juston seyfert has this power Lets say I use juston to give his sentinel a free attack, then what would happen if I used some one like black talon that can mind control friendlys, to target juston? Can he use his new directive power to give his sentinel ANOTHER free attack? I know you're not allowed to use the same power twice from free actions, but what about vanilla attacks? Is there a limit on them too?

The real question is can he be given the free action to allow the Sentinel to make other move action as a free action? Without the move action, the attack can't happen.

That said, I don't know the answer to either.

As I read it the free move action must be given in order to make the attack.

If the Sentinel has any game effect that can be triggered by a move action then it could use that as one of the free move actions and then it can use the other free move action to make a vanilla move.

The Sentinel can only take one free move action in a turn. So when you MC Juston to use the power again, it won't work. The attack isn't an action of any type so he would be able to do that except he can't make the attack unless he moves

Ok, so mind controling juston is pointless because his sentinel couldnt be given 2 free action moves

Unless the Sentinel has different move actions it can take.

Example: Korvac. Juston can cause Korvac to move 10 squares(or 8 if carrying Juston) and attack. Then Juston could be MC'd to give him another free move action, this time activating Phasing/Teleport and attack.

No it's totaly not pointless.

A character can be given 2 move actions as free actions as long as they activate different game effects. Note that in this case the free move action is not given to activate a specific game effect. The wording is pretty much similar (only the type of action differs) to the free attack actions granted by charge and running shot.

Lets say that your sentinel has Phasing/Teleport. Then the first time that "PROGRAM IN A NEW PRIME DIRECTIVE" is activated then the free move action given to the sentinel can be used to activate that. Then later when juston is mind controled by Black Talon then the free move action can be used to activate a vanilla move. Or vise versa of course.

This is not entirely correct.

From the WES rules forum:

Note that the attack in this case isn't an action of any type.

If you are playing against the Green Power Battery and are limited to only a single free action, you can still move and make the attack.

But like the others are saying, you need to be able to activate different types of moves with that free action to make multiple attacks.
Leap/Climb, phasing/teleport, and/or some special power activated by a move action combined with each other or a vanilla move action would work, so if the Sentinel has any of those then it could be done.