Came upon another small annoyance with the musicmagic plugin behavior:
if song shuffle is on, your listening to one list and you create a new
mix with mm, and click "Add to Playlist"- it kills the current song,
reshuffles all songs (old and new list), stops all paly and requires
that you hit play again.

With shuffle off, it works as one would suppose: it adds it to the
bottom of the current list and continues to play.

Can't imagine the top scenerio is by design and it is not obvious that
shuffle be turned off when Adding playlist. .