Not true! Timers for PTAT programs save the PTAT recording without using another tuner, or you can save recordings from the PTAT menu.
You misunderstood. In my market, all six of my local stations are on one transponder. PTAT records the whole transponder, then saves the "big four" network programs to the PTATs folder. What happens to the two PBS channel's programs that are also on that transponder? They get deleted. And if I wanted to record Downtown Abbey, for instance, it would require recording that PBS stream twice - once in the PTAT transponder recording, and once for a PBS timer.
It occurs to me that the Hopper could be smart enough to record the program from the PTAT transponder recording, saving the other two tuners for other programs. Then you could record 7 (or 8!) programs at once.
I'd really like to see PBS added to my PTAT folder. And at least in my market, it would require little more than a software update and some extra hard drive space. I know not everyone likes PBS, which is why I think it should be an option.