Thanks :-) Developer & customer feedback is a big deal for us and we've been working to add new capabilities that people want. Anything else you can think of that you'd like to see us do or enable in the SDK?
That said, you COULD go the way of several hacks I've seen - marry a high resolution external camera to the Kinect rig, do the correspondence, and use the external camera as your face recognition input.
that said, we do enable you to use the infrared feed and marry that to a hi-res external color camera.
Your sdk is slow moving and limited for all the resources that your empire has at it's disposal.
Do note, that the SEC report the last I checked, included the biggest competitors as Linux and the GPL. The last they'd give is source for the free masses to use.