BTW we already know this stuff can work without CableCARD because it worked for TWC Austin. TWC Austin uses PSIP to map the channels to match the cable channels #s. When the local Austin users complained the cable guide data was missing information, additional guide data was added. This allowed TWC Austin users to have there digital cable channels on S3 map to proper guide data without using CableCARD.
Later on this functionality was disabled. I think the guide data was changed, but it could have been TWC PSIP changed their mapping. TiVo said they don't support that config. I relaying from memory what one of the TWC Austin users posted so I might be remembering details incorrectly but the main gist is there.