FYI: How they are classified (fighter/attack/bomber) comes from their historical use. You can use them however you want in-game. However, C205s were never used as an attack plane, nor as a bomber. Thus, in AH they only ever get "fighter" status.
The button doesn't tell you how you can fly it. The button is only for score-whoring purposes. Who cares? Just take the plane you want and fly it. Yaks, 262s, 163s, p40Bs were never used as anything BUT pure figthers. At least, the versions *we have* weren't.
You'll notice, however, that the P-40E does have it?
I'm just wondering why all the fuss over such a minor issue.