I know this won't fix the actual issue, but why not fly the aircraft that have a two-position prop with CEM enabled in the meantime? I mean, the prop only has two positions, it's not exactly complicated to use.
Whenever your speed drops go to high RPM, as soon as you pick up enough speed go to low RPM and watch your airspeed increase even more. It's like driving a car with two gears, very simple and it will allow you to fly the aircraft better.
Contrary to popular belief, keeping the RPM at full does not equal full speed. Also, the airspeed affects the kind of RPM you'll get for a given pitch setting, so if you're not using CEM and you have trouble accelerating just point the nose down for a bit to pick up some sped.
It's just that since the prop only has two positions, it will only reach optimal RPM around a very narrow band of airspeeds.
To really solve this problem i see no other way than code an extra routine into the engine "auto-management" that will go to fine pitch whenever the RPM drops too much. I think it shouldn't be that hard, it's just an "IF RPM<2200 THEN pitch=fine" type of statement with a similar one that will force coarse pitch when the RPM picks up a bit, so i guess we'll see it in a patch. Until then, try with CEM enabled and see the aircraft transform from a dog to an actually enjoyable ride
