In regards to clans, implementing a way for clans to have 2 crews working together would be rather difficult without making clans extremely overpowered.
A very cool and immersive way to balance out clans would be to add a mechanic that allows a crew to commandeer a ship they've boarded.
The boarding crew would go up to the crow's nest to change the flag, then wait until all crew members are either dead or after 5 minutes.
After commandeering the ship, the clan can have another crew join into the lobby with the stolen ship as that crews ship.
If either ship is sunk, the crew is moved into a new lobby.
