what feats can be used on Dark phoenix?

also when declairing multi attack can she say on the rook use Running shot twice for a total of 10 damage?

Multi-Attack (optional): Give the big figure Sentinel a power action. This character may take 2 free actions
against two different targets, or two free actions against a single target. These free actions may be power
actions, ranged combat actions, or close combat actions. Separate attack rolls are made for each attack. If
either or both attacks are successful, the damage dealt for each is reduced by one, to a minimum of one.
The damage dealt can be further reduced by defensive powers and abilities. If this character controls a
captured character, it cannot use this multi-attack option. Multi-attacks cannot be used to capture. The
multi-attack power cannot be countered or lost. Free actions used when using the Multi-Attack power
cannot be used to activate another Multi-Attack


I don't see why not since running shot is a power action