Favourite a playlist/song - with a new favourites link

So similar to add-folder-favourites-t223.html but allowing for a favourite playlist, or favourite web radio channel accessible off a main page - perhaps without being in a subdiredtory, say on the same level as the Spotify/Webradio links for quick acces (I’m thinking of the local radio station here, where I’ve managed to figure out the iHeartRadio playlist, and would like quick access to it.

Also the request to run a playlist of boot, would be a useful feature here.