I made an extension for Spotify that allows you to bind your own custom global hotkeys to control Spotify when not in focus. It really made my listening experience a lot better, so I figure I'd share it with other people to see how they like it.
All you have to do is put SpotiKeys on your dashboard and treat it as your Spotify app. It will open Spotify like normal and enable your hotkeys. Your hotkey menu will be minimized on your tray by default.
THIS ONLY WORKS FOR MAC OSX
Download the dmg file and extract SpotiKeys to your dashboard.
Download here: https://github.com/ivanshen/SpotiKeys/releases