Note: Not using vim as a pager. That's covered extensively on the Internet.
When you press Tab to complete various kinds of stuff inside vim/gvim, it brings up a fairly basic pager. For example, enter
:help taTab. You get a list of matching items, with the pager prompt like this:
-- More -- SPACE/d/j: screen/page/line down, b/u/k: up, q:quit
How do I replace this pager with something a bit more sophisticated?