Currently the idea is to have the expansion effects last until the end of the mission so I can control how much alternate art I have to do. Basically all events on a map that also has a BE or AE event will have alternate art. I would love to do art for all of it but at the current budget I have to have a cutoff point before release. (BUT I will say the game is set up to support permanent changes just in case it is something I want to revisit after release.)
And thank you for your support, glad you like it!