Ive been pondering how to not only play co-op pirates but to have a lot of fun doing so. The main criteria I see for a successful game of friendly pirates is difficulty and randomness.
It must be difficult or else it will be simple and get boring quickly and it must be random so that fleets dont get built as an awnser to the challenge.
A reacurring thought I have is to come up with several random challenges like seamonsters, growing storms or forts with Marines then randomly combine them after fleets have been built with the hope that there will be nearly insurmountable odds to go up against with no preparation encouraging teamwork more than anything.