Thanks for that Jeff. That is helpful, as I had forgotten about that edit mode being a possibility.
You mention you had the problem with a Wouxun. I noticed the problem when I first programmed a Wouxun KG-816. I had assumed that when the offset was blank it would Tx on the same frequency, then later discovered I was wrong.
My channels are grouped, they are arranged by Tx frequency so that I can color code the appropriate antennas. So my only dilemma would be if I sort on Duplex, getting them back into ascending order based on the Tx frequency seems like it would be problematic because I don't have a Tx frequency to sort on, just the offset. But if I see Duplex = (None), then in fact I do have simplex after all?