Someday you'll be old, too
I found how to change settings so most is right with the world. What I don't see is header level indicators that I've replied to the message. Outlook has it and the previous incarnation of the Yahoo mail client had it.
With the old incarnation, when I hit reply, it defaulted to simple text mode with a caret to the left of each line of the original message. It was a simple matter add blank lines and my reply to each line. To do the same now, I have to add carets or whatever indication of original text. It's as annoying as not getting hot air out of the center vents of '80s MBs but at least that's just a matter of rerouting vacuum lines.
Sixto
87 300D