I'm not sure if this has been suggested already, and it's not entirely a FRED2 issue, but here goes:
Make the player ship allowable in *any* wing, and as *any* number in that wing.
Allow a choice, in FRED2, of which wings can have their ship/weapon configurations changed by the player.
Allow a choice, in FRED 2, of which wings will be displayed in the little graphical friendly ship health/departure display.
It would add so much, IMO, to have an option for the player to be, for example, Delta 2. I think it would be a fairly difficult coding change, unfortunately.