If anyone is interested, I'm going to start working on a reverse of the Multiplayer Campaign hack. It will be called
MP Revisited. Basically, when you start a Campaign, the smaller Multiplayer maps that we all grew to love will load instead. I don't know if I'll ever get around to this, if it is even possible or what the outcome will be, but it would be interesting to see all of the NPCs crammed into a Multiplayer map.

Also, if anyone used the Multiplayer hacks in Campaign, let me know what you think.