You can edit the shows after you download them and decode from the .tivo to .mpg file using VideoReDo if you are using windows. It is similar to editing out commercials, but instead of commercials, you would be removing the unwanted content. If you are worried that the original file will get cropped, it won't, because VRD will make another file with the wanted content, original is untouched. Then if you want to watch the cropped version, they can be sent back to the Tivo in the .mpg format.
Series 2 (Retired, now sold)
TiVo HD 1TB (157 HD Hrs, PLS, "S3HD")
Roamio, Oh Roamio!
The TiVo Apocalypse begins on Sat 2013 Feb 16 00:00 GMT!