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Since mpd does not have those fancy features, how about a workaround: Let's add a special playlist (e.g. "MY SPOTIFY LIBRARY") that one can add tracks to, and they are added to the spotify library instead of a "real" playlist. Just like pressing the "+" button in spotify. Listing that playlist would show all the tracks in your spotify library.
I'm tired of opening the real spotify client when I like a track, just to click a button and quit it again ;)