I've been testing this on my sandbox servers, and the "Automatically Ban Banned Users?" option doesn't seem to have any effect.
Whether I have that turned on or not, it still puts the new account in the COPPA group.
Maybe I'm missing something here, but it seems there is some bug in the system in regards to the banned users.
I see in the plugin code the following to ban a user:
PHP Code:
//ban the user
if ($marpautoban)
$userdata->set('usergroupid', $vbulletin->options['marpbannedgroup']);
But, I can find no where to change the setting for what group the marpbannedgroup is. I don't even see that setting being added in the xml install file.