Take a look at Rowan's "Battle of Britain"; if you can find it.
As a sim it was an apalling piece of work, but it also had a stragey side to it that was fascinating. You play the air commander, watching the battles play out on a map board, and you can "enter the sim" from the perspective of any of your units in any role - pilot or gunner, for example, or not fly at all and stick at being the Air comnader.
The concept of the game was great, it should have had IL-2 beat into a pulp, but the code execution was so atrocious it died upon release.