As I understand it, Rogue is only brought in when Kitty is dying from Logan's mid-movie freakout, so that wouldn't address that.The other plot hole is how Kitty is able to maintain her temporal mind meld with Wolverine for days on end without taking a break for eating, sleeping, or other bodily needs. Having Rogue around to borrow Kitty's powers and spell her is the only way to make sense of it.
I thought Rogue's scenes involved the destruction of the mansion, so I don't see how her scenes have any real impact on the movie's plot.