Thanks for the information, then I don't have to do one myself.Currently there is no option to remember what regions are open or not when loading the project, but there is a suggestion/bug report for this on the 2.3 fourms
YoYo Games
help.yoyogames.com
Thanks, I will use this until they implement a saving system for it.I don't think so.
However you can use control + m, close all open, control + u, open all closed, control up/down, move up and down between them, and control + enter, toggle open close on the region you're on.