Impressive mod, an absolute cornerstone of any mario 64 coop game night. I'm gonna have to take a look at how the items are coded for some of my own game mode aspirations (With proper credit, of course).
I'm gonna also have to look into seeing if I can make custom maps for this. The gamemode format is a nice middle ground for map ports that don't have to be edited for arena while also giving them more purpose than mere hangouts.