I have my SMH10 paired to the BMW Comm System (which is great). Don't know if it is possible, but is there a way to mute music? I didn't see anything about it in the instruction manual. It would seem a firmware upgrade could make tapping the jog dial (when connecting the system as an A2DP) mute the system speakers. Would be handy when you roll to a stop and want to answer a quick question rather than rotate the jog dial to a low level sound.
Jog Dial Mute Button for bluetooth music