When I ran spotify under cinnamon 2.2 it seemed to be integrated really nicely with the sound applet/tray icon (whatever they are called nowadays). My keyboard (Microsoft 4000 something or other) has some media buttons including a play/pause which worked out of the box.
In KDE, the volume controls work but the play/pause has no effect.
I realise the answer to a question that starts "Can KDE be configured to do ..." is yes but any idea how? Do I need to start finding character codes and writing python to drive spotify?