In general I would just like to see terrain get used more in the game. So I like the idea of searching for something hidden by the fog, like a UT or something. I generally don’t even use terrain honestly.
One alternate rule that I’ve used that slows the game down well and makes terrain in general more useful is that you only begin with home islands, and you can use a ship’s action for the turn to “discover” an island, by placing an island at least L-away from that ship, and 3-L away from any other island. Then the player to your left places a piece of terrain within S of the island, so typically between the ship and the island.