I have searched quite a bit on this. Although it was not true A2DP it looks like up until recently there was a workaround to at least play music through a bluetooth headset using a couple of methods.
The first *#307# and that no longer is a valid number to call.
The other was to start a song and then go into VVM and click audio to select the audio source.
Neither work for me on 2.2.1
I know people are probably going to blast me for it...but this feature even coming through "mono" would be fantastic.
Are either of those working for any of you and if not...when did they block those methods?