Don't have the time right now to post the actual changes, but to change to list format you'd just change the templates/default/island_new_users.tpl file.
If you want to display more, then just edit the cache_builders/new_users.php script. You'll see where it has "limit 5" in one of the queries. Just change the 5 to the number that you want to display.
Donate to UBBDev today to help aid in Operational, Server and Script Maintenance, and Development costs.
Please also see our parent organization VNC Web Services if you're in the need of a new UBB.threads Install or Upgrade, Site/Server Migrations, or Security and Coding Services.