I imagined a new world event where your crows nest glows bright, signaling you have been given the awesome alliance flag which you must raise and sail to the other ship on the server that has been given the flag to merge your ships together to make a cosmetic cross between the two ships. This ship is bigger and has an on-board catapult (doubling as a sail) which you use to destroy an airborne enemy - a Pterodactylus.
If the ship hasn't appeared yet the Pterodactylus swoops on player ships and is visible when flying around in the sky from a distance.
I think the game needs more flying birds to attack, but do you think this is feasible?