This was possible on S2/S1 units that had to use a cable box. You could put the Tivo on any given channel, I usually use CSPAN or other channels that have programming in large blocks (i.e. 6pm-10pm for a certain show) and then use the cable box remote to put on On Demand. Play the show and tell the Tivo to record what it thinks is the channel you put it on. You end with with the wrong program info but can record On Demand programming. That is no longer possible with Tivos that use Cable Cards.
Keeping a job isn't about knowing how to do it, it's about knowing how to make everyone else believe you know how to do it.. --Choccy