This is probably the coolest idea for admins I've ever seen.
Awesome job.
Would it be possible to have a message somewhere saying how to talk with admins, because no one knows how unless they come in here and read it. So maybe when a player types /admin it prints the msg in console, then below the admin list it says like "type ! <your message> to talk with all online admins"
If that's already somewhere and I'm just blind, sorry and good job.