Love the plugin, great job. I made a small customisation to suit my needs and thought you might like to include it in a future version. For example if the post already existed on the destination blog I wanted to maintain the post_status (draft etc) in order to allow a very basic level of moderation.
Line 437 I changed from
$p = wp_insert_post( $post );
$p = wp_insert_post( apply_filters('sitewide_tags_post_insert', $post) );
Keep up the good work.