It would be nice to have the possibility to configure what navigation keys (up, down, left, right, pgup, pgdown, home, end) do when a message is selected.

Now, all of the navig. keys move in the list of messages within the mailbox. I.e. "up" selects the previous message, "home" jumps to the first message in the mailbox, etc.

I'd like to be able to configure that these keys would instead affect the viewing of the body of the currently selected message (without having to click on the body of the message to manually select that view/frame). I.e. "pgdown" would scroll one page down in the selected message etc.

Ideally, this would be configurable on a per-key basis. For example, I'm used to having the following setting:

left - moves/selects one message up
right - moves/selects one message down
up, down, pgup, pgdown, home, end - all affect scrolling within the currently selected message