I just flashed alpha 6 from cm7 7.0.1 stock, with the stock kernel as well, and I got the rom to boot but the touch screen just wouldn't respond at all. The volume worked, but it was reversed as well. Just thought I'd relay my experience.
Mind posting the Vending.apk from that? It'll take me a while to download the whole ROM as I have slow internet. I want to test something.