anyone will probably tell you the only thing a mirror is good for is looks. They are basicly useless in all other aspects of flight in a FLIGHT sim. The screen is far too small and on a computer game, hitting the hat and looking back is just as good. They'd be nice to have, but only for added looks.
Go pick up a flight sim that has mirros in it. Lockon, IL2 and you'll understand what I'm saying.