I heard you had problems with finding people for massive tests? so just release the Client host a server with the maximum player limit and let people join.
=> You can test player limit, lagg, scripting functions with many players and and and
AND the players will be happy
AFTER the test just shut the server down and its good (anti cheat removed in the test version of course)
If you want to test sth new, just release new Client and host new server