Maybe PMView Pro can already do this....

It wouldbe great if there was a preference switch that would allow the mouse scroll wheel to control the zoom magnification (zoom in and zoom out). The current default is to load the next/previous image, I believe.

I use several CAD apps all day long and they pretty much all use the scroll wheel for zoom control. It causes me a bit of confusion when I switch to PM View and suddenly find myself flipping through a bunch of images when I roll the wheel.