Let me go a little further into my explanation
Do I use realistic tactics? Yes. In a 109, I usually use hblair's 'monkey logic' (see assassin page on 109s) to kill people with 30mm.
However on the deck, fightin Spits and La7s and idiot P-51s, knife fighting, riding the stall in the weeds (stuff you don't know much about), yeah I'll cut my engine. 90% of the time it's when someone is on my six and I want to perform evasives while knowing where they are by the sound of their engine. (right now I can't fly because my dopplar sound is broken and i use it extensively)
Like HB said, it's not that big of a deal and just because you wanna fly the most ultra-realistic p-51 sim out there doesn't mean that hitechs valuable time should be wasted on a bug or feature or whatever that gives such a slight edge. You don't lose a fight because someone cut their engine. You lose it long before that IMO.
I'd rather see a revamp of the entire engine management system then a quick fix of something MAJOR MIDNIGHT, CO 412TH thinks is so much of a factor in the game. Here's a clue -> it's not.