You'd need to write a mut for it the thing is if you setup the serverextend mutator well. And just put a wildstar behind the username (but change the ban exeptions
). Basically after the server is full with 32 players it will just allow more people to join. And will slowly expand that way.
OR if you want it the easy way just type this everytime the map changes:
adminlogin <admin usrname> <admin pass>
admin set Engine.Gameinfo MaxPlayers <players you want>
adminlogout
Otherwise you basically need a mutator to do that serverwise for you, or wait for the next ro patch.