No "Official" RTV facility. However there does exist a hack to accomplish this. It does require you to remove the hard drive from the replay, install it in your PC, run extract_rtv to access a file, edit the file in a hex editor, write it back to the hd and restore the hd to the replay. And this is only good until the next time the channel lineup changes (which erases all your careful work.)
If you're not discouraged by the aforementioned, feel competent to the task, and are desperate enough (as I was to be able to use the guide with my direct cable connection where channels are almost never at their assigned locations) send me a private email and I'll be happy to fill in the details.
Sean Riddle was kind enough to share his knowledge of the inner workings of the system and I've added some automation to it to make it easier to accomplish. But I have to warn you, there is danger in these woods and you have to be very careful and meticulous to succeed.