Leo, thanks for your reply.
I'm disappointed that Ctrl+uparrow and Ctrl+downarrow aren't available for this function, since that's the key combination I naturally use.
In my experience, the main reason for wanting to scroll the lister like this is to see the file names that are "coming up" while moving down through the lister. Often, the selection cursor gets to the bottom line of the lister, and I can't see what files are "below" it. I have to down-arrow a few times, to see the filenames "ahead" of where I'm up to, then up-arrow to get back to where I was before. I find that this gets pretty irritating.
Another way to avoid this problem would be to scroll the lister before the cursor reaches the top or bottom, by specifying a number of "downwards scroll context lines" (that's the best term I can come up with) of, say, 3 lines. When the cursor is within 3 lines of the bottom, moving further down would scroll the lister (unless there are no more lines to scroll), so the "next 3" files are always visible. A similar setting for the upwards direction would probably be useful too.
Is this a reasonable suggestion?
Kris