There is a playlist module in jamroom, its called "Playlists"
The way it works is when someone is logged in to jamroom and they are browsing your site and they locate a song they like, they click ADD TO PLAYLIST button then create a new playlist or add it to an existing one. Then those playlists will show on their profile.
Its not an M3U playlist. Im not sure how an M3U playlist would work within jamroom now since files are not uploaded via FTP anymore.
How are you hoping an M3U playlist would work?