[kicker]

The more I think about it, the less I am convinced the connect feature is a good match for this plugin. Apart from using the same librespot binaries, there is not much common with the aims of this plugin, IMHO.
I have installed RaSpotify meanwhile and it works reasonably well. The only missing part is integration with Kodi - if you start e.g. movie in Kodi without manually stopping spotify music first, you run into problems. Kodi does not know the music is playing, it will not display even playing indication, even less any song info. Having a plugin which manages communication between librespot and kodi, so kodi can stop playback and maybe even show some song info would be IMHO enough for my use case. I am not sure how big is the overlap of functionality with this plugin, though...