There should be an option for fights between clans inside of a individual nation. Some sort of Civil War ability. Right now any individual clan can go rogue and totally disrupt a nation with little to no recourse by the other clans in nation. Case in point the Russian Clan BF is totally undermining Vera Cruse by having all the surrounding ports "Open to all" and the other Russian clans have no real way to make them stop. I am sure there are clans like this in every nation I can think of a few Pirate ones who know they do not have to fear being attacked by fellow pirates so they do all they can to troll their own nation to the detriment of the entire nation.
By adding this Civil War option it would allow clans to attack and punish these rogue clans so their would be a cost to their trolling or playing against the needs of the nation as a whole. Even it it mean taking the rogue clans ports by force. It would also give Nations a way to deal with Alt dominated clans