How about having a report open and immediately toggle to zoom view. And then the client can easily click one time to be anywhere on the report page that he wants to see close up. To do this, put code such as the following behind the command button that opens the report:
DoCmd OpenReport "MyReport", A_Preview
SendKeys "z", True
Note that the SendKeys statement sends out a small z just as if it had been typed from the keyboard to toggle to zoom view. Unfortunately this code does NOT work from the report's OnOpen property.