Like the title says - this script does what it says on the tin. The shortcuts work fine, however there is no consideration as to whether I'm typing in the search box or not etc.
Thus typing an "n" results in skipping to the next song. This wouldn't be hard to fix though, just by adding a second button (alt or ctrl)
Aren't many shortcuts either - although I admit that there isn't much you can add in this respect.
Could do a few things like change the page title to the currently playing song and things like that though!