To add to the list
This has NO historical basis but it would be nice a “Ship” with the same use as a granary. A ship that you can station any place in the water with very slow mobility where fishing ships can drop off food from fishing or fishing nets. the equivalent of a modern Processing Ship.
I wonder if the meta would allow a Battle Mode on ships, let’s called “Beached” or “Anchored” with 1.5 the packing/unpacking times of a Trebuchet, where it would take a few seconds to activate and a few seconds to disengage. but doing so it would give all ships a plus 3 range if they are touching the shores (Beach only, not cliffs or rocky shores) or in Shallows. except for the obvious ones like demolition ships and fire ships.
This Mode would allow longer support from the sea to land units but at the cost of making them more vulnerable to other ships and land units.