I can understand why people do it, it's stupid though. Even when the engine is idling the prop still produces some thrust. Theoretically turning the engine off would decrease that thrust and you'd slow down faster, but what they don't understand is that it makes such minor difference that there is no point to it.
one thing is real life the other is what happens in the game. it may not be the same thing for the sake of not wasting coading time for no reason.
when the engine is turns on some people thing about gas flowing, spark plugs... etc ( am not a pilot so i dont know how it goes) but it could be that it just engine starts and it it takes a while to go full throttle while in the ground, however up in the air it may or may not be the same thing.
of course I dont know either how the game is coaded or how the engine works in real life. but one thing I know for sure is this. I seldom see anybody turning the engine off while in flight. and actually the only time i seen it down in past couple of months was while doing a memorial flight in the TA.
so I dont really see point to fix something that either isnt a problem or doesnt happen ofter enough to fix anything. or it may go of the way of the other "problem" that got fixed. people turning off engine sound so they can hear other planes. surround sound doesnt sound as awesome as it did before.
semp