There are distinctly two different "schools of thought" concerning the historicity of micro-management of internal gadgetry during actual combat, in comparison with our tendencies as simulation gamers during simulated combat. I believe both sides have been adequately represented by some very good veteran players who posted before me, and therefore I probably need not repeat any of them.
I'll just say I agree with bozon. The interpretation of historical facts and anecdotes seem to suggest that while the use of "exotic tricks and maneuevers" did exist in the field, all other facts and statistics in regards to the gross majority -- the average and everyday combat pilots of those days -- would suggest that ignoring the manual/protocol/S.O.P. would have been considered as a very bad idea, which pilots would in most cases would actively tried to avoid -- assuming that such thought would even cross the mind in the first place during the confusion and terror of deadly combat.
It is also important to recognize anecdotes for what they are -- they are first-hand experiences and citations which works best in delivering the feelings and emotions of combatants to the listeners and readers. However, they are also notoriously inaccurate, most often embellished, exaggerated, straight-off bragging which in many cases cannot be cross-checked against historical data -- a modern-day "dime novel", or "wild-west story", if you will.
Ofcourse, I am not saying the pilots lied in their testamonies. I am sure that the pilots themselves were in everyway earnest in their testimonies, and they tell stories of how combat went down in the way they remember it. I'm sure they truly believe in everything they say, because they really do remember everything happening that way. However, it is a known fact that memory is a very, very unreliable thing.
I do believe that a handful few group of pilots -- whether they be experienced and adept, or just plain cocky and crazy with balls of steel -- would no doubt try their hand in fidgeting with all the set levers and buttons inside the cockpit when they had the chance, but considering the fact that rookie pilots with less than average 5 mission/sorties would likely make habitual mistakes of pushing the wrong button or pulling on the wrong lever, I'd wager that such practice was fairly uncommon and most pilots would adamantly try stick to rules and regulations. If anything, in times of critical danger, (contrary to popular belief) most people really can't think "outside the box" and would not be able to try anything crazy in the first place.