I'd love it too... to have more engine management. But I see the problem that it could put off some people. To fully understand and make good use of temperature, prop and mixture management would require some reading. There was also many different engines and systems on the WWII birds, it would be some job to properly model the planeset we currently have. What would happen if we could overspeed the prop and damage the governor?
"My engine died while I was diving! I didn't do anything! Noone was shooting at me! It's a bug!"
I'd love it though...
But it would set the experts further apart from the new players than we see today.
Hmmm, it doesn't seem to have hurt IL2 much...