Hi Moritz,
The first being that you should be able to add a title to the queue and play it as the next song even if the player is put on random.
with my
latest image for the Raspberry Pi2/3 you can randomly add songs to the end of the queue.
Each time your queue plays the last song a new one from the playlist gets added.
All your manual added songs are played first.
My second improvement would be to make playlist files (.m3u) appear as folders in the library.
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I like this idea, but not so easy to implement.
Frank