Well here is the AvA situation. We can't really have the same things as MA because we can't have win the war map resets.
Can't really have any usable perk or eny system.
Believe me, every setting imaginable has been tried.
We have tried many things with icons but those who said they wanted them on never really participated in the arena once we turned them on.
We have done some internal polling and we run the arena to what a strong majority of people who fly there want to see.
Thursday nights we do turn enemy icons on for the 8thAF mission.
I do have a future project in mind that would be a world at war terrain that would be split into pacific and ETO, MTO

You would still have a situation with plane sets unless you wanted to make it all latewar, but then you really wouldn't have the realism of early engagements like BOB etc.
I suppose you could do a rolling timeline.
Starting in September we will have a war going on Tuesday nights where the winners of each weeks battle will choose the next weeks for an overall victory strategy.
http://bbs.hitechcreations.com/smf/index.php/topic,337838.0.html