In the comics and animated show she could do it, but I never really liked that. It is sort of her channeling the lightning through her, which I think is lame. I was very upset with, well, pretty much all of X-Men 3 really.
but "channeling the lightning through her" would mean it came from the sky, went through her, and hit an enemy, right? or maybe i am misunderstanding you cuz i am tired and it is like 3am here
anyways speaking of that in the deleted scenes storm shot a lightning bolt through logan's left hand claws while his other hand's claws were in someone and i thought that was awesome XD