Miguael – there isn’t any code to import existing posts, but you can disable the privacy check by commenting out this line:
add_action(‘update_option_blog_public’, ‘sitewide_tags_public_blog_update’, 10, 2);
Anyway, you have the source code to the plugin, so you can do whatever you like. 🙂
Andreas – disable the pinging option in the settings page for that blog?