there is some bugs in the admin settings page view image uploaded, you also added the possibility to redirect the page after 5 seconds but you did not add a setting for it and are asking us to add this using .htaccess... Also i am sure that the setting "Enable error pages even while forums are closed" is useless because vbulletin wont allow any page to be access if the site is turned Off.
edit: since the plugin is only for vbulletin 4, obviously i am using vb4

( minversion="4.0.0" )
edit: please see picture # 2, there's no text next to the home picture.