Scrolling up / down by 1 line

[Mandar Mitra]

Hello,
I'd like to be able to easily scroll by one line in copy mode. Right
now, I can only do this by typing 1 + C-u (or C-d), but that's not
very convenient. Can I define a binding for the combination? Or can I
set the amount that C-u/C-d scrolls by?
I've only recently started using screen, so pl forgive me if this is a
newbie question.
Thanks,
mandar.