"+shelter" made me want to stop playing yesterday after running around looking for an alien without finding him and realizing I'd have to check every one of 6 staircases and 2-3 downramps. Blaster doors are nice, but ...damn that's a long way around and having to check every behind every one.
"+forest" (might have the name wrong, newish map with walkable-on water on a coastline) is awesome, but the starting point for the aliens mean they get stuck in a little alcove at the bottom of the main big cliff. I think I just learned how to take screenshots with my non-standard iMac keyboard, so next time I'll try to get screenshots up.
I'm hoping to join the mapping team eventually, and to start off with just a nice vanilla desert thing followed by just straight up forest.