Two comments.
2) Making the PTAT recording variable (selectable networks and days) argues AGAINST the oft-reported statement that a whole transponder is being recorded. Sure, this could be just a GUI change and the whole transponder could be recorded and the Dish execs claiming it's the whole transponder might be right after all. But IMHO, particularly if we're only talking about only 200GB devoted to PTAT, the Hopper is and always has been demultiplexing the transponder into 4 and only 4 channels. This is why we couldn't have any more than 4. This is why Dish can now allow selective recording of network channels. This is why it takes so little room on disk. And (on the plus side and this is really pure speculation) this will allow Dish in the future to give us the opportunity to select any 4 HD networks, and not just the Big Four.