In case anyone is still following this topic, I have found a MUCH easier way to modify channel lineups. If you drop me a PM, I will send you a link (I don't think the link can be posted here - it's not the "other site", but a site overseas).
I don't want to sound like I am dismissing Zirak's effort. His hack is great, but it just wasn't what I needed and it didn't work well with huge lineups like Dish Network. It just so happens that in this particular case, some things can be done much more easily outside TivoWeb.
Bob
[Edit - sorry, I'm no longer offering any type of support for this topic. It's long out of date, I no longer even have the links to the site I mention above, and I'm not familar with you guys' new-fangled software versions, as my Tivos have been stuck at version 3.0 for years. Sorry to those who have been PMing me on the subject]