If I set a timer to record only new episodes of a PT show, will it use the PTAT tuner and then copy it over to the user side, leaving me with 2 copies? Can I set the beginning and end padding on the PTAT shows?
Yes, but I think there is only one actual copy (2 markers to the same file). No, PTAT is set in stone. Don't see why this may not change in the future though.
You can pad your own timers but it will probably use a second receiver if you extend beyond the 7:55 - 11:05 PTAT window.