A few things I ran into with my 6600:
1. Accessing the camera does not work with the 'fast' version of the Python runtime. Details fail me because I deinstalled the fast version and didn't write down the error. I remember it was in camera.py line 11 where it tries to import something like _camera.pyd (which doesn't exist).
2. The default (and only) camera exposure mode in the normal Python runtime still is 'night'.
3. selection_lists do not cover the complete screen. This is notable when running the application in 'large' or 'full' mode.
I would encourage you to keep developing the 'fast' version because the speed increase is incredible! Keep up the good work.