Is ghost gamepass allowed, because me and my friends have a system for regular play that might help here, but are we allowed to use it in multiplayer runs?

The rules say that "In multiplayer runs no one is allowed to become a ghost with the gamepass".

I think this answers your question. But I don't really play this game, so I can't help too much. But that's the only time gamepasses are mentioned in the rules

Oh ok, I think we should have a sub category (like shop or no shop) for this