I have a global story variable set up and it is showing up in the triggers. I must not have it set up right, it is a string variable, I think I have to give it a value somewhere or I'm not setting up the trigger or region correctly. Hopefully someone will upload an example sometime soon, the base campaign is a big mess to look at for help.
I have a decent workaround for my current campaign. I am going to setup separate instances of the maps, so when you leave one map and then go back, you are actually entering a new version. That allows me to change NPC's and interactions easier too.