I would like the ability to disable controllers.
For example, if you are playing Star Fox on a true N64, and select VS, character/vehicle select only appears for the controllers that are currently plugged in.
I'm assuming that Surreal 64 acts as though the controllers are always plugged in, because selecting VS. mode in Star Fox 64 brings up 4 selection screens no matter how many controllers are plugged in. So if I want to play 2 player VS. Star Fox I have to switch my xbox controller and hit start for the missing players, and then have two ships randomly flying acrossed the screen.
By the way, on a scale from one to awesome, Surreal 64 is SUPER GREAT.