Although I'm not certain if there's any options or dependancies I'm missing, what I now know that I have to enable is:

Claude Reveret notified me that a vanilla 2.6.13 will work, however I'd recommend using the latest -mh patches for complete BlueZ functionality. This (plus the -mh patch) is what I needed for kernel-space controlled Bluetooth HID and the possibility of handling the control over to user-space.

Note! It appears that the code which would make the Media-keys working is broken in 2.6.10-mh* and 2.6.11-mh1, so stick with the latest patch for 2.6.9 or 2.6.11-mh2 or newer!