@Дед Ебун: Yes an admin can make a permanent label which users can not modify :)
@P4sca1: You need to generate it on the client but you can modify it on the server. The addon uses simple Valve ones, but the navmesh tool included provides a user interface and a tutorial to make this process even easier. And yes, it supports several floors. As you walk into a room the map automatically adjusts its height:
