Gary, if your mouse is programmable you could write a macro to do that (I think). Or you could try the built in windows magnifier by holding down the windows key and pressing the '+' key, subsequent presses on the '+' key will zoom in more and pressing the '-' key will zoom out.
You can configure the magnifier in quite a few ways so it's worth having a play around with, but it's not as sharp as using the flash zoom.