[kh99]

If I understand what you're asking, then yes, you can usually change vb settings in a plugin by resetting the value, if your plugin is at a hook location that gets called before the value is used. The settings values are in $vbulletin->options['setting_name']. You have to know 'setting_name' for the setting you want to change, of course. You can figure that out by looking at the code where it's used, or by hovering your cursor over the value in the admincp (I think you need to have the site in debug mode for that to work). You can also look at the html source for the settings page in the admin cp, if all else fails.