Jab, the whole back of the wing moves on the 109, it's the 190 that uses the kind of flaps you're talking about.
or maybe I missunderstood you.
Tac, yes, it does make it unstable and stall very easy, just like the 190. However, it turns better (although hard to maintain in good turn).
But this is not just about using them in combat, they could be flown in speed up to 220, don't know if they blew up if you exeeded or if the just brake or something.