Ran into something interesting with enabling PTAT... We were at my brother's on Sunday and he was talking to my 12-year old daughter about Dish and the "Hoppah" and she mentioned AutoHop and how to use it. Turns out they turned PTAT off shortly after getting their Hopper because his wife couldn't watch TV in the bedroom (taking up tuners - I suspect now it is a "user" error).
Anyway, I enabled PTAT and in his "My Recordings" folder, anything recorded during PTAT times now shows a kangaroo icon. These were shows recorded days or maybe weeks prior (they were near the end of his recordings list, sorted by date). So, even if you don't have PTAT enabled, the receiver still downloads the "file" that tells the Hopper how/when to skip commercials and will apply it retroactively !