Rogue should be like Peter Petrelli in some form.
They could developt her powers if want it, and making she can have more than one power at the same time, and not necesary permanetly, just during hours or something.
Oh, yes, definitely give her some other powers on a temporary basis. That IS her power, after all: taking other peoples' powers. I'd like to see her take these powers:
BOBBY: Bobby breaks up with her after she takes the cure, and when she comes back, he's together with Kitty. When he first sees her, his heart bleeds for her, but he quickly closes his heart to her and makes some sarcastic comments about her taking the cure to fend off his feelings for her. He doesn't know that she has her powers back, though, so she shows him: she lays one on him right in front of Kitty until he passes out. This marks a change in her attitude toward her powers: experimenting with Bobby's powers, she realizes that she herself is powerful.
GAMBIT: She briefly takes his powers to show him her powers when they meet. Just a sexy little Gambit/Rogue touch for fun.
MYSTIQUE: Gambit and Rogue break into Senator Graydon Creed's office in an attempt to learn more about Sentinels. When Mystique was a human, she worked her way into Creed's office as his secretary so she could give information to the Brotherhood (run by Pyro while Magneto was gone, though Magneto takes over when his powers return). When Mystique's powers returned, she killed Creed and assumed his identity (the family ties don't exist, though Creed still hates mutants for the same reasons as in the comics). Gambit and Rogue fight Mystique when they accidentally meet in Creed's office, Rogue finally taking Mystique down with a leg scissor (the bare legs draining energy thing I was talking about earlier). She uses Mystique's agility and strength to fight her, then uses her shapeshifting abilities to escape.
MAGNETO: By the end of the movie, the Brotherhood and the X-Men team up to take on the Sentinels. I'm not entirely sure of this part, but I'm thinking that Magneto stays out of the actual fight in the same way Xavier always did. In chess, you never play the king unless you absolutely have to. Instead, Rogue takes his powers and fights in his place. It would be a great way to show how Rogue has grown up since X1, when his powers were forced on her and she couldn't control them.
Of course, with Gambit in the Wolverine movie, Gambit/Rogue in the movies seems even less likely than before. =/
There aren't really any opportunities in my X4 for Rogue to take more than one power at the same time, unless there were a reason she would have to quickly swipe powers from one of her teammates during the final battle. In my X5, though, I'm sure she would, since she would have Pyro's powers on a permanent basis. My X5 features Apocalypse and the Four Horsemen, and I'd like the Four Horsemen to include Archangel and Wolverine. I'd love to see Rogue fight Wolverine in the final battle, even if only for like 30 seconds before she gets help. She would take Wolverine's powers while still infused with Pyro's.