I would love a docking/anchoring feature!
I saw someone making docks in their harbor and positioning their navy in it to make it look like they are docked. But such an actual docking feature would be great, similar to the encampment feature. This would reduce its upkeep, reduce its workforce and make it heal only flightly faster, so that the repair cranes still have a use.
Maybe even make it so you can dock or anchor. Where docking gives more benefits but requires space near a road/quay. But anchoring only required shallow waters.