I've heard that people that aren't enrolled in this school have played in the past. However, this year, you have to have a BSU account to register. My friend wants to come up during the week to play. Is this not possible? :<

It's possible - the admin simply have to override the @bsu.edu requirement. Whether Jason's willing to do that, however, I don't know. I'm not sure if he doesn't want to allow non-BSU students into the game, or if he just wants a very tight control and knowledge of who else is playing.