I want to suggest the ability to set navy-army attachments. Reason is simple: it's all too common to have armies with attached navy to have home province which is far in-land.
Currently, navies are destroyed by destroying the attaching army. So there may need to be a lock outside friendly territory. That said, the navy destruction aspect is a bit clunky as well.
[Feature suggestion] Ability to (re-)attach navies
Re: [Feature suggestion] Ability to (re-)attach navies
That is specially relevant when you make your 9th US army and it end up in Hawai without a navy, therefore completely useless.
Re: [Feature suggestion] Ability to (re-)attach navies
I feel like the navy should have its own units, instead of being "attached" to land units. The navy system which is in the game right now is just unusually oversimplified compared to the rest of things. I would actually like to bombard coastal provinces with navies, yet I know it's not the primary focus in the game and naval bombardment will become obsolete when spaceships appear.