I would like more realism, but it would create a need to revamp the game. Also, realism equals harder. The harder it is, the less likely the chance of the masses likinig it. Less popular equals less income & the need to work the programming. Some planes relied on a wing mounted gun as a main or backup. That would be difficult to model, especially when you still need to fly the plane as you fire. Rotary engines would also turn one direction better from the gyroscopic effect of the spinning engine/prop & torque. Planes progressed rapidly in that time too, so later planes would typically be better, but early planes could have a place if aircraft choice was dictated by a specific time period. True, long range head on shots would disappear. This game isn't good for teaching combat maneuvering. Realistic maneuvering would be difficult without a way to watch what the other guy was doing, as with a hat switch. That's critical when you add energy to the mix.
The bottom line is that there will be only a couple of planes that players would pick & they'd be the higher perfomance panes or those with better firepower or bomb load. The rest would be abandoned. You can see that in the game now. Since many fighters didn't carry bombs at all, save for the occasional one brought & dropped by the pilot, missions would need to change too.
I really like the idea of fairly accurate flight characteristics, but it also presents problems. That guy that likes to fly at max altitude to avoid fighting to bomb would be unstoppable unless you were relatively high too. You'd stall out getting to him. As it stands, the flight programming is probably good for what the game is, an arcadish WWI combat flight game. Anything more & it'd be better to progress to a bonafide PC online sim like Aces High. That type of game leans on realism much more & things like fuel load, energy, even flap usage matter a great deal. You also have to think about the plane you fly & how it best performs (don't turn fight a Zero with a Corsair, like real world).
I've been distracted about 50 times writing this, so forgive my disjointed rambling. Long story short, I think too much realism would be outside the scope of the game & the devices players use, but we could use a little more of it.