Once a week, then the "newbies" will have moved elsewhere. I think there should be a time set everyday, example: 6pm for reset! Until you get a auto adding whitelist.
Brilliant server. To get in just read: http://theindiestone.com/forums/index.php/topic/4183-iwbms-the-i-will-backup-my-save-branch/ At the end it gives you a password for the branch, get in via that and join the server via its IP address