I've always been more inclined towards a strict airframe approach for specialization, but I want to be open to possibilities. We'll play around with this during PTO playtesting. If nothing else, it might get used as an optional rule.
And yes, Mark, I'm pretty sure the A-36 had dive brakes.
...just checked with Wikipedia, and the A-36A had dive brakes, as ordered by the USAAF for its role as an attack plane.
As for more planes, don't hold your breath! But I like to keep the options open in case something comes up.