I wrote Tim Gill of Quark, Inc. with a suggestion as to an XTension I hoped he might create for QuarkXPress 3.2, and Scaling Clicks is the result. Thanks to Tim for being so responsive to customer needs, and for giving me permission to distribute this XTension!
Scaling Clicks adds a command to the Utilities menu, which, when selected, allows the user to option-click on the document to toggle the views between "fit-in-window" and "actual size." Thus, you don't have to press Caps Lock to engage the toggle feature. The grabber hand is, of course, disabled when the scaling clicks command is selected.