I know this is a stupidly slow reply. But I actually have a solution to that. It's best if everyone just uses the first X number of switches/variables.Neato, this sounds like a fun opportunity to try brainstorming some minigames.
One thought I had, if everyone's minigames are going to be put into a single compilation project, perhaps having a pseudo variable/switch sign up table wouldn't be a bad idea. Just something like, say I'm participant #3, so switches/variables 301-400 and common events 31-40 are reserved for my minigame, with more being request-able if I think my minigame would take more. Probably not something that would be required or anything, but would help keep things a bit easier to combine down the road.
I'll use the one that uses the most, then assign variables/switches later in the set for that number to each mini-game, then whenever you leave a mini-game map, I'll just dump all of the "active" maps and switches into their storage stuff and on entrance of that minigame again I'll load them back in.
The only thing that will have to be juggled a bit differently is common events but hopefully that won't be nearly as much manual editing.
Also, Voting for the minigame contest will start on March 5th! This will give everyone who wants to vote plenty of time to play the entries. (Also it gives me time to handle it since I'm going to be at PAX East for work starting Tuesday, so won't have time to run voting then )