Moonpools aren't the only rooms that do this. Supports on structures are automatic if there's something suitable for it to connect to and it's not built on a foundation.
The underwater farm would be awesome, especially if depth change wh…
Definitely multiplayer/co-op. Just something simple, like 2-4 players being able to survive together. At this point, I don't think the map is large enough for anything like 20-30 player groups. Too crowded and not enough resources.