I've been looking for something similar, except i'm trying to permanently disable/remove the stock music player controls. I use Poweramp which has its own lockscreen controls, but every now and again the stock music controls will appear on the lockscreen as i'm using poweramp. I've removed the stock music player (via TiBu) and i'm on 5/10 Angry Bean, but just can't seem to find any hints to help achieve what i'm looking for. If anyone has any hints/tips let me know!!!