A feature or permission node to allow specific groups to be able to hide on dynmap when vanishing would be great.

Example:

Guest Group - Forcefully logged in vanished to hide from other guests taking the membership quiz. Visible on dynmap to see if there are any new players with ease or simply see how many players are on the server.

Staff Group - Can vanish to watch players freely. Forcefully hides on dynmap if vanished so the player doesn't know that the staff member is watching them.