I was wondering if naval mining of trade routes would be an option or perhaps included at some point I know it was used off the coast Norway to cut off steel to Germany.
Mines are a key element of naval strategy and have been one of the biggest causes of ship damage and loss in the last two world wars.
That said, laying and sweeping mines is long, tedious, dirty work that takes a long time to carry out in either direction. For that reason it is unlikely to make it into a strategy game that needs to be fun to play.
As Director well says, while mines are significant (both damaging major warships and accounting for the loss of quite a few smaller ones), it's tricky to get in, in a sense that's 'fun' gameplay wise. I think it's possible, mind, but naval warfare tends to be a bit less of a priority than the other arms of combat, but you never know - if we got a naval-oriented DLC and PDS were able to come up with ideas, it might work. I'm definitely going to try and mod them in, but don't want to promise anything until I know I can deliver.
@Vukodav - if we are modding in mines, I'd mod in smaller ships than destroyers to do the minesweeping work. While some older DDs were modified to sweep mines, the vast majority of the work was carried out by purpose-built minesweepers and multi-function military trawlers, and if we're modding in mines it'd make sense to put these vessels in as well.
I'd personally prefer a minefield to be a 'state' in a region, that's deployed, that then creates the potential for a ship to be damaged or sunk until it's detected and cleared. There would be chances for both enemy and friendly ships to be sunk, but much higher for enemy (more than a few ships were lost in mine friendly fire accidents). Minesweeping patrols around the coast (an automatic mission) would do this work, and then other vessels can try and lay the mines (aircraft/subs/surface vessels) as appropriate. That way it's possible to have both offensive and defensive minefields, hopefully of different densities. Doubt we'll be able to mod it in to this level, but I can hope.
Mines were cheap and very good at sinking ships, but how do you balance that? More detailed system of naval mines could help. For instance air observation and triggering of mines and so on. There are, as always, many ideas. It is just a question of how deep one wants to go and what he wants to gain from it.
AI is ALWAYS the problemI think the biggest issue would be teaching the AI not to go near mine-infested waters, and to know which waters were more likely to need avoiding. All depends on what we have to play with though, but no harm in throwing ideas around before then - your ideas are definitely solid, don't get me wrong.
Naval mines will tend to break away and disperse if they are not tended regularly. Let the mines have a small cost but have to be renewed by destroyers or submarines every month?