I'd be very interested in this. Coming from working with nLite extensively and having to try and find the same power for Win7 in WAIK has been nothing but a headache. Hopefully this gets released.
I had a problem like this also. And as simple as it may be, are you using the Win7 version of WAIK? I was using the older version till somebody let me know there was another one and that fixed it right up.