I reckon that naval stuff will be auto-resolved anyway.  Naval stuff requires a different engine to work and ETW, while being by far the best, still isn't as fun or easy to manage as land battles.

same here, make it matter but not be a burden on my time.

I want those underwater resources in the dev journal

if there are naval forces... there will be more than one unit.  (transport and warship of somekind both being required to count as naval forces)

chances are there may also be water creatures.

I want water dungeons.  The kind heroes and channelers can only enter if "water breathing" or similar spell is cast.