Actually, as I understand it... there is a firmware, it was never released due to legal issues that never got sorted out with pioneer.
To make it work you'd need to get the firmware from phatnoise, and the other more important tidbit is that you not only need the right cable to be made, only the latest rev of the phatboxes support it. (there is some extra chip in the output path that allows it to work with specific heads and that is required for pioneer support.)
so, basically, yeah its possible but it wont happen. The kegs are not compatible as they are based off an older board design and are missing a key component.