Unfortunately, none of these questions have anything to do with the plugin. The plugin does not search for synchronized lyrics. As far as I know, there is only one source for synchronized lyrics, which is MiniLyrics, which uses a proprietary system to deliver them.
Everything to do with the display of lyrics, how they're embedded, "Correct lyrics on website," etc. is handed by MB, not the plug in. The plug in simply adds additional sources to MB's built in sources.