When she has to launch Wolverine up to the torch, Storm claims that her powers "don't work like that" and she can't guide him very well. Yet her powers keep her perfectly steady earlier when she comes up the elevator shaft that Toad has thrown her down, and subsequently when she flies/hovers after him out onto the terrace.
Ummm, she flies by generating winds. That's why her hair and stuff are blowing when she floats up in the elevator shaft. It's also how it works in the comic books, which aren't necessarily correct for the movie but seem to be correct here.
Yes storm does fly by generating wind. She floats herself using the billowing cape things attached to her wrists. Even in the comics she doesn't fly well without her cape. She has years of practice flying herself around with the cape, but not much experience flying another persons body around with no stabilizer. the cape acts as her airfoil like a sky-divers airfoil-parachute. Have you ever seen the movie cutaway or drop zone? They show skydiving "chambers" in those movies that have a giant fan that blows air verticaly up through them. A person wears a baggy jumpsuit that give a person enough air-resistance to be suspended by the airflow. Storms cape works much in the same way as the jumpsuits, only give her more control. Only instead of a giant fan Storm makes the wind using her power over nature.
Storm can fly because she generates the wind, if she were to try to fly Logan anywhere, he would get buffeted around alot because the wind is coming from storm, or around her, not around Logan, if that makes sence.
Anyway, this is a film, they need to make things flow and have exciting things happen, if Logan could just GET up there straight away then that would kind of stuff things up, wouldn't it?