i keep reading about trim and flap issues so i will put in my 2 cents.
trim on real aircraft is set mostly at straight and level flight at cruise speed or when you are going to maintain a consistant speed for a long duration ( a climb up to 15k or .. ft)...and that is not 100% or WEP. it was usually 60 - 85 % power. the more you throttle up the more torque the engine generates and depending on the aircraft will cause drift to either the right or left. when you power up to take off you need to give some rudder to keep you straight down the runway and you trim up as you climb to altitude but will adjust when you reach your level cruising speed and altitude. and this is the way i set up my trim during the game. in a dogfight sitution or when i kick it in the ass i dont even worry about it. i will be all over the place anyways.... WEP was not used very often .... let me rephrase that ... not used as consistantly as it is in games. on the P 51 there was a wire on the throttle. 100% was firewalled against the wire. if you got you ass in a bind, needed that little extra get me the hell out of Dodge speed, or to gain advantage in a DF you slammed hard and broke the wire...they had a term for that but i cant remember at the moment. but it was an injection system ( only familiar with 51s ) with a limited amount of water and ...nitromethane??? so it didnt last long and was only used sparingly.
as for flaps...combat flaps were common use. at the link below at the bottom is a bunch of reports of how 51 jocks used this and the results...when playing arcade i do the same by dropping gear momentarily ( with good success )
http://www.wwiiaircraftperformance.o...t-reports.html
i am not trying to pee and in anyone's wheaties....and i have been playing this game a very short time comparitively... and a game is not reality...but some of this stuff does translate into gaming use if used. so read the reports and experiment a little...might give you an edge.