Glad to read that someone else is doing that.. I suggested it in this post concerning dual songlists.
http://forum.mtu.com/showpost.php?p=38212&postcount=30
They seem to think that it was too much work. I think is saves work after it is set up.
Singers names can be displayed while a singer is singing, switch from playing a song from one playlist to another, You can work on several playlists at a time, maybe even copy/paste, You can dual task mostly anything if you dare try.