or maybe the players could go back to assigning objectives to players in missions. If your designated a "capper/cover fighter" you score it as fighter, if your a dive bomber you go as attack. Of course then you would have to count on those that are your bombers to be able to bomb and the fighter to be able to fight other wise you would need even MORE players in the mission than the horde brings now.
The only reason they are not needed as separate groups now is due to the "roll a base" mentality that most players have these days. Everyone go heavy, everyone wipe out the base and town, every one cap. No one can "specialize" any more because they don't have the skill and count on numbers alone.