I don't have mine anymore (Possibly a mistake) but I never felt the need, it had done a couple of European tours with some reasonably quick riding around the usual suspect roads in Italy, Austria, Switzerland. It never twitched or shook it's head, loaded or unloaded. Always found it to be very neutral steering and quite agile.
I totally agree I dont think it needs one either, I have ridden V85s in North Wales and The Picos beautifully stable chassis, the question was asked by someone who has had one on every bike he has had