With most of the aircraft in IL2 being fitted with Constant Speed props, we need our friendly mod community to change the "prop pitch" message to a "Engine RPM" (or something similar) and it would clear up most of the problems in understanding.
The only ones that would be upset would be the LW pilots that use the manual pitch settings, which we are told lead to a can of worms anyway! ( That would lead to a bigger whine than 109 at full throttle
)