I don't know if this would be even fun...but I thought I might bring it up for discussion....
How about a "Be the Ref" mode, where are the ref, and you have to make the calls in a game. you could look at replays and use certain keys to decide which call to make...you could have a "Ref Rating" that shows how much of the time you were correct, etc.....and be able to eject players, coaches, etc....
I'm being kind of vague with this idea, I can't really get the idea out.
It sounds boring, but maybe with some more ideas, it could be fun? I dunno *shrug*...What do you guys think?