I have a suggestion for the ATC in Microsoft Flight: the ability to both joke with and scream at the controllers.  :D

I was reading a book by an air traffic controller who said that pilots often yell at ground control (and not in relation to Major Tom  ;D) if they're forced to wait/caution other traffic (Did ATC do this to you much, Lou?  :)). Also, FSX lacks the ability to mess with the controllers. In one instance, a pilot in a GA prop plane requested to land on the snow beside the runway because he had no wheels. This put ATC into a frenzy, which ended when a plane with skis descended from the clouds to land.  ;D