Computer building ships while blockaded?

[dopp]

It would be nice if ships couldn't leave a harbor without fighting the blockading fleet. It was an old Royal Navy strategy to blockade ports to prevent the various enemy squadrons from meeting up.

Sometimes when ports are close by on the map I get this hilarious situation where I blockade an enemy port, only to see the fleet inside sail out and blockade my own port next turn.

[Joshwa]

Blockaded ports should be able to build ships, but only be able to move them to attack the blockading fleet. If blockaded ports couldn't build anything, i think it would be open to a lot of abuse by the human player-you could blockade all their ports with just one ship each, provided you have their regular navy taken care of, and it would be nigh on impossible for the AI to lift the blockades.