You most certainly CAN edit them. All you have to to is, in the scan screen, highlight the parameter you want to change ( frequency,SR) and THEN press any number on the remote and a small EDIT/ADD box will pop up. Select EDIT, and edit your parameter however you want, then press OK and you are DONE!
Well, talk about being easy but not the slightest bit obvious... I don't know if I would have ever thought to try that! Know any other non-obvious controls like that?
Anyway, here is what *I* did... it's a small variation on the previously mentioned technique. Not sure why I did it this way since the other way would probably have worked just as well, but anyway...
I had previously entered the 3720 frequency and 26.700 SR, so I did Menu|Installation|Channel Search|0000 (PIN)|, selected 91.0W Galaxy 17 (C) as the satellite, changed the scan mode to Manual, made sure it was on 3720 and then changed the symbol rate to 26.667. Bear in mind that my C-band dish position is controlled by my old analog receiver, so I physically moved the dish to point at Galaxy 14 (125.0W) and then hit the red button on the Diamond remote to scan. It scanned in a bunch of TBN channels on 3720. I then physically moved the dish back to Galaxy 17, changed the symbol rate back to 26.700, and exited out of that screen.
I then went to Channel Manager|Delete Channels|0000 (PIN) and moved the bar until I was over the first non-HD, non-AC3 channel. I hit the green button to edit, changed the name and PIDS for the first CW feed (CW East|101|102|101), and exited out of the Edit Channels box. Moved the bar to the next standard definition feed and repeated the process twice, to enter the other two CW feeds. Then I moved the bar over all the other channels that had just been added from that TBN mux (other than the three I had changed), hit OK to mark them for deletion, and exited that screen.
I'm sure the other way would have worked just as well, it just made a bit more sense to me to do it that way for some reason.
So, one problem resolved - now if only we could figure out how to get the NBC feeds to display properly....
I did find one other issue though. The clock on this unit seems to be unreliable. If you set it to use GMT with a local offset, it seems to get its time reference from different places... I wish you could pick one channel and say to use that channel only for a time reference - anyway, last night the time was accurate, today it was three hours behind and I have no idea why. I have now tried switching it to not use GMT (which I suspect really means to not use an external reference) but IIRC I had it that way to begin with and it wasn't keeping time accurately. So we'll see. On the Pansat, an inaccurate clock was merely an inconvenience, but on a unit with a PVR it makes it pretty difficult to schecule a recording. Still experimenting with that, though.
Thanks again, stogie5150 and everyone else who commented.