Islands are possible to generate of course,. but we need more functional watercraft before it’s desirable.
Yes boats would be cool, vehicle-sized ones for the player (this is partially implemented), and possibly larger ones hacked in for NPC factions.
The way our map generation works, a seed value wouldn’t be at all stable, we’d have to rewrite that whole part of the game to make that feature work.
Having said that, the mapgen is really hacky in places, so it’s possible we’d do exactly that.