From February 20th, 2014 to May 2nd, 2014, 50% user give 5-star rating, 50% user give 1-star rating. for Spotify Controller chrome extension.
Exactly what I was looking for you can change the shortcuts in the extensions manager.
Unfortunately, this doesn't work. CTRL + SHIFT + N is reserved for starting a new incognito window. CTRL + SHIFT + SPACE/P just doesn't work.