I'd love the ability to - mid-air - split a squadron, if for some reason several UFO's appear, and all of my fighters are currently enroute.
Secondly, I'd like Squadrons to be able to reform, basically able to rendezvous with fighters or dropships enroute and continue the escort.
(Obviously the fuel level would drop to the lowest amount if that is going to be an issue)
I think this would add more to the game, and also means that if you have long range fighters out, and they engage an enemy UFO you can have them rendezvous with the dropship you may have moved by itself half-way.