Implementation of the command /warn?

This is mostly aimed at staff. I think it would be beneficial if there were an additional command allowing staff to warn players so that the next time they log in they have the reason up on their screen.

Another plus side could be that if they are warned twice (which merits a ban), the system would automatically ban them.

Just a suggestion, I'm not great with mods or plugins, so if anyone has any idea as to whether this would be useful or good, then post a reply. Thanks!

Forgotten_B

sounds like a great idea especially if it were a simple cmd like
/warn name reason
/warnlist
/warnremove name

yeah, it's included in the plugin group called Essentials. I've used it a few times.