[Klemm]

It's weird but with all the years I have played this game I just kinda "know" when I'm going to stall and just ease off in whatever manoeuvre I am doing.

Might be handy though if it was indeed a feature in some aircraft.

Thats not weird, I have that feeling too after years of playing Il-2. Its only natural, like riding a bike or walking.
And the buzzer would first: be unrealistic because none or only few of those planes back then had it, and second: there would have to be already some code in the game or would have to implemented that gives a feedback that a stall is approaching. On second thought, the buffeting sound could be replaced, but its already audible enough and gives ample warning IMO.
Just learn to feel the airplane through gaming experience. That helps with anything, for example i don't even have to really aim, i just know where the bullets will go (of course i need the gunsight as a pointer, but nothing more).