I haven't been a TWC manhattan customer for a long time, but to the best of my recollection this auto mapping behavior is standard on their HD DVR boxes as well. You tune 7 but it pulls in 707 behind the scenes. My guess is that whatever signal is sent that tells the box/cc to do this must happen in the hdmi handshake. That's the main thing that's missing when you plug your cable card directly into your set. Can't be sure but probably something like that. And likely no way for you to undo this. Choice indeed would be nice (as I originally requested).