I think from the A-4 on it was possible to fit MW 50, but it wasn't until the A-8 that it was actually fitted as standard.
Yup, this was the case. BMW 801 in Fw 190A-4 had provision to accept MW 50 but it was used only after A-8 and later models.
In brand W A-8 has top speed several miles slower than of A-4 in all alts. Climb is bit poorer due weight and you don't even want to think about turn rate! Wells claimed that it had turn rate of more than 30% too slow, if I remember correctly.
A-4 is better fighter, only asset that A-8 has is better guns (MGFF's replaced by MG 151/20's on outer wing positions and cowl MG's are 13 mm instead of 7.92 mm) and maybe slightly better dive.
The problem with Fw 190 is that it is extremely lethal fighter for some period of time. Good pilots and Fw 190's could easily dominate the arena. There has been claims that in brand W Fw 190 was made bit harder to fly that it really was. I don't know if this is true, I certainly don't have data to back up those claims. It will be interesting to find out what kind of FM Fw 190 has in AH, I have been thinking about it since I first time heard about AH

Oh, one thing. I would like to see a specific key for special boosts like US methanol injection and LW GM-1 and MW 50. If they are married with generic WEP, it just does not give you the warm fuzzy feeling when you engage it

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Oblt. jochen 'Stern von Afrika' 2./ Jagdgeschwader 27 'Afrika'