Also keep in mind, you would proably have to revamp every movement dial for "in atmosphere" movement for all fighters.
For example, Tie's have GREAT turning in space. In atmosphere, they couldn't be any more sluggish. No aerodynamics.
Keep in mind that in the film The Empire Strikes Back the wonderful little Ties did a fine job zipping around in atmosphere as they harassed The Millennium Falcon around Cloud City...and then followed our heroes right into space too.