I am not sure how it could be implemented, but I think naval mines should be added to the game. Here are some ideas I have thought up:
Patrolling naval bombers will automatically set mines when patrolling a region OR
Naval bombers can be set to drop mines in a small region
Naval bombers while on patrol can seek and destroy mines
A ship hit by a mine will loose about 15 or so health (could be changed)
Visual:
Allied mines will be shown as a red blur in the set region. (Mines will blow up allied boats if not avoided / or not)
I think that this will give players more reason to research naval bombers, as they are currently rarely used.
Patrolling naval bombers will automatically set mines when patrolling a region OR
Naval bombers can be set to drop mines in a small region
Naval bombers while on patrol can seek and destroy mines
A ship hit by a mine will loose about 15 or so health (could be changed)
Visual:
Allied mines will be shown as a red blur in the set region. (Mines will blow up allied boats if not avoided / or not)
I think that this will give players more reason to research naval bombers, as they are currently rarely used.