It became a common AW technique to allow sceanrios that were obviously unbalanced, such as the battle of Brittain. You did (for example) three frames as a Brit, and three frames as a Hun, and an aggregate score was produced.
This showed the side which had the most efficient command structure and superior tactics over time; and it engendered real unit forming as people trained to function as a unit for weeks leading up to a scenario.
A good example was Moon dog's P40 squad in the PH scenario. No one gave them a chance, but they'd practised intensively, studied every thing chennault had done and truely "owned" the Zekes.
Which brings on another scenario point: A lot of people, when they start this stuff, are aghast at how their favorite plane flies. They "know" the P40 (or for that matter the 109) was the superior plane, they have the factual results of the battles and the stories thier cultural background supplies. When they find the P40 is pretty much meat in arena play they naturally suspect the model is off and cry "foul". What they're missing are the tactical and leader ship aspects of combat which only really show in a scenario. For example, the Jug, although a strong plane, will never rule the arena. But put it up in flights of strength at 27K and give it the job of ensuring the Buffs get there, and you'll see it earn new respect from the LW, who, in turn, are there to buff kill, and thus get past the jug, not to fight the jug per se.
Dam! I want some scenarios. And not at 0400 my time either!