Allow me to play a Playlist
It seems I must select all and then play. Why can't I just play the playlist? Then, if new items are added automatically (as happens for a smart list), they could just go to the end, or sort according to whatever rule. But I would not have to re-select to include them in the play. Thus, I would have a continuously refreshing list - incoming items are automatically queued for play, and played items automatically drop off the list.