heya Money,
the "automatically dropping "2" notches of flaps only occurs if one uses "Auto-Takeoff"
if you uncheck this check box under options/preferences/flight you will not experience this....you will however have to manually start the Engine and take off manually..... ( throttle, trim adjustments (if u need em ), etc.....
as for the auto dropping of the F4U flaps, I personally never had a problem with it, even before it was "asked for / needed"
nor did I ever experience any PROP dragging because of anything...... ( and I am known to fly the F4U series 99.9% of the time )
hope this helps