AFAIK there's no direct, easy way to shuffle within a list (queue or playlist) of currently playing material. For example, if I've queued up a list of Dixieland tracks, I want them to play back in a random order, but not, not, not(!) into other lists, etc. This is the same with playlists. If I have a playlist of my Dixieland albums, I may want to hear the list of all tracks in the playlist in random order. AFAIK this can't be done now.