CUSTOM SKINS!
Co-op campaign.
More options when setting up online games (loadout, views, radar, allied/axis)
Cockpits for flyables
Ability to kick
Leaderboards that work
Adjustable FOV (like IL-2)
Co-op single missions.
Better Hardware support (like A:AA)
Take off and landings used online.
Land to re-arm.
B-17's banned from dogfights