GPMDP is an awesome application to use Google Play on the desktop. The only problem with it is that the built in keyshortcuts are very limited by design. They only allow shortcuts with the Control key, but if you use Emacs this is very limiting.
Most media control keys can be configured using the built in media keys for your DE. The 2 shortcuts that I was missing are to like a song, and to raise the player (I generally have it closed to tray). After some digging around dbus and sockets, I managed to write a copule of simple python scripts to accomplish this:
song_liker.py: