Add an embargo feature in CCNet Nations please. It's essentialy a trade access block. This would be in the form of /embargo nation add, /embargo town add and /embargo player add.
What would this do? Simple. You would have to be a special rank in the nation such as Diplomat/CoLeader/Leader to do it. What this would do is prevent embargoed people from using your nation's capital /ah, the nation's shop plots, make embargoed people not appear on the /ah tab or appear as censored for the nation members and make embargoed people unable to purchase your goods on /ah and shop plots.
Imo this should be a thing to allow nations to regulate their trade flow and also make them able to prevent undesired merchants from using their capital as a trading station. I see no reasons as why this shouldnt be a thing in all honesty. For people that say just lock the shop chunks from outsiders thats just unfeasible and bypassable with zeppelins lol, a command would be way better to restrict foreign merchants and I also stated more reasons than just capital /ah restriction.