It's on my ever-expanding list of stuff to do to add proper SCO and A2DP support to LinuxMCE.
It will take modifications to Bluetooth_Dongle, as well as a whole new class of devices, and handlers for them in the media plugin, and other fun bits.
We also have to consider other issues, such as what happens when headphoness move into other coverage areas (for follow me, etc.)
-Thom