It could be awesome to have more metadata options, like %rating and %time (to display a clock)
and a feature to have a (invisible) server rediction.
like "hsl.fm/stream" redirects to "c2.radioboss:port/stream"
so people can listen without seeing the mention "radioboss" in url stream
should not be too complex to create.
edit : i also had a great idea to help playlist creation.
in music library, simply using ctrl + a or a buton "select all" to not have to select one by one all the tracks of a folder.
or maybe a small client sofware to manage track collection and built playlists.
edit 2 : also a possibility to having track in multiple folders.
cause you have to upload the same track 3 times to put it in 3 folders, and takes much more space on our very limited storage space.
i think i gived few tricks to make radioboss the best radiomaker (this slogan is a gift, happy birthday ^^)