Jack,
I don't understand why PageUp and PageDown would not serve your purpose
in Maximized view as well as in any other view. That's what these
commands do: they move the text by one screen, whatever the size of the
screen is.
Now, are you sure that the PageUp and PageDown keys are assigned to the
PageUp and PageDown commands? Perhaps they're assigned to something
else, like BrowseNext and BrowsePrev. To find out, press Alt+Ctrl+Num+
(that's the plus sign in the numeric keypad on the right of your
keyboard) and then press PageDown, and a special version of the
Customize Keyboard dialog box should display telling you what command is
assigned to that keystroke.
Larry