robin wrote:In the toolbar above the preview pane is a button with an "H" in it - this cycles through the header options.
Is this what you meant?
No. It is a pain to cycle through all the time. Most full headers are so long these days that you can't look through the message body if the full headers are displayed so you end up constantly clicking the H and scrolling. Then there is the constant mouse movement back and forth.
What I would like to see is a hover. Hover over the from area and it would display the headers. Perhaps depending on length of hover it could cycle through full and short. This is just like your FastReading feature although this could be more like a tool tips display.