Sort playlist to newest first (top on playlist) from iPhone app. Like you can do on the computer. If you have like many tracks in a playlist (over 2000) and you want to play the latast song you pur in there. You have to scroll down the hole playlist every time. When the song have played and stoped you have to do the same process. With this your newest tracks is always on the top and never stops util the playlist have play the hole playlist.
I hope more likes this idea.
And sorry for my bad english, but i hope you will understand.