[Plugin pls]

I think this would fall under as a suggestion rather than help.

[How to know seed]

Correct me if I'm wrong, but I believe "/seed" is a command that can be executed on servers as it can be on single player worlds. Your telling me that it does not work. If that's the case you could try simply restarting your server if you have not already tried that. If it persists to do the same thing, you can always try running the command in console, then checking the logs as it may respond with it that way, I'm not for sure though.

[looking for smp server that has nations]

I never find any, did you ever try making one yourself?

[Bug where you can grief the map and get some items.]

Yeah, it seems unnecessary to "fix" it. I discovered that as well, but it don't really matter honestly, especially when the lobby restarts every 12 hours.

[Plugin Updates - November 18th]

Citizens updated, good.