Frank, Out of the box, there are two "wheel mouse zoom settings" you can use: - Fine Zoom: This is what you get when you roll the wheel. We are all using this.- Coarse Zoom: Hold the CRTL key and roll the wheel. You will zoom in closer or zoom out farther with the same wheel motion. Many people may not be aware of this one ... Sorry I could not find a setting to further control this ... I am just a ProductView guy. Regards, Andy B.www.productview.com- ProductViewBasic Training $89, Advanced $99 These are the PTC terms for this, not mine.