I can't answer your question fully since I am at work, but my setup at home has an iMac with a VX nano using Steermouse. on the VX there is the scroll wheel, and then almost what could be described as a switch that you can push up and down, kind of where your index finger is. I know the scroll wheel won't do one page at a time. It spins really easy and sometimes I find myself scrolling too fast, but I am guessing that you might be able to assign the page up or page down buttons to that switch I was describing earlier.
As for the MX I know there is a different scroll wheel and some more buttons, so the functionality might allow this as well.
I will check later and let you know...