1 I'm not sure what the fascination is with caves, they are super rare IRL, and would be a horrible place to go looting in a setting similar to TWD like our game is. Maybe people have played too much minecraft, but to me caves are really pretty boring when there are POIs and a full world to explore. Any cave generation system would have to be coded by someone. There is nothing to expose to modders if it isn't written.
2 We have bridges working, but I just don't see much value in making overpasses, we've been struggling to get a half decent looking RWG for 5 years now complicated designs are just going to look ugly/buggy/set us back. When we get all the rwg bugs fixed maybe that could be done, but its arizona desert, its just not something your going to need in an 8k section of Arizona.