Well, the plugin certainly needs some work (though idea isn't bad). I think, to work properly, it needs to somehow bind MusicBee's controls with VLC's, so MusicBee would know, when VLC has finished playing, 'cause right now if user would skip some part of video, when the playback ends, the plugin won't jump to the next file.
Docking VLC (like Mediamonkey's video-player) and starting/closing it along with MusicBee would also be very welcome.
But anyway, it's a nice start )