- Shipyard building. Not ships, the Shipyards themselves. If the campaign aims to run the admiralty and not the country (which I agree with) at least the ability to request the Government to build more of them.
- Real world and chronologically accurate company names to act as build 'queues', and then show in the ship stats. Even different quality depending on the builder. Vickers guns for my Dreadnoughts . I think HOI III did this IIRC.
- License production/buy ships from another country - as it happened in real life.
- Stockage in shipyards and docks. Ammo, fuel, raw materials, spare parts, sailors...
- Coastal defenses? Think of the Blücher sunk in the Oslofjord. Or the decommissioned Spanish Jaime I guns that were installed as coastal defenses.
- Linked to the two previous ones, the ability to build components for ships detached from the ship. I.E: I design a 20000 ton BB with x6 14inch guns and then order the build of the 20000 ton hull, x8 14inch guns, and then install the x6 guns and leave x2 in stockage or as spares for repairs. That would be amazing, and would make for a deep simulation of a country's naval forces with its logistics.
- As it has been mentioned before, no hard limit on time.
- Some kind of mechanism other than random events to influenciate the country naval policy as head of the admiralty. Yearly meetings between the admiralty (player) and the Defence Minister/Cabinet head for instance?