Well, for example, an ncurses interface would be nice. That way I wouldn't need to use NX or other RDP software if I wanted to use spotify from my jukebox computer.
Depending on the functionality you need, you can also use DBus with the native client. We implement parts of the Mpris2 specification. If all you need to do is change tracks and play/pause on your jukebox machine that should work with a few simple scripts.