Here's an idea: create dynamic links to mod folders. In Windows-speak, that would be a Shortcut. Then, PBW would create a unique shortcut for each game, which would be mirrored on all the players' machines. So, if there is a game called "The Best SEV Game Ever", it would be created with a "mod folder" called "The Best SEV Game Ever Mod", which would then point to the mod folder being used. To upgrade one game to a new version of the mod, simply redirect the shortcut to the new "Mod v.x.xx" folder, which prevents PBW-wide game upgrades. I could probably write a short little dialog program that will search for the SEV folder(s), list out all the mod folder(s), and then generate a specifically-named shortcut to the proper place, if it turns out this works. But next week. Too much school work to finish this week
I leave it to someone else to try out the shortcut idea for now....