What moot said. The no-MG option would be nice. Also, the Bf110's rear ammo takes a while to fire off.
More weapon and ammo options are a definite PLUS.
I've suggested before a slider type configuration. Want 43% cannons/MGs/whatever? Easily asjustable. Either in percentages or bullet count... would be a great addition.
The same for fuel selection. 25, 50, 75, and 100% are too large of a "chunk" of fuel. A slider would be excellent. Even further customizable individual fuel TANKS. I would crap my pants twice if this feature was implemented. I hate waiting to burn the Fuselage tanks in P40s. C.205 would also benefit. I'd leave the wing tanks empty and take 100% main/aux instead.