How to change shortcut used for temporary zoom (accessibility feature)? I have a particular application that has extremely small detail for some of its controls, and no way to zoom anything larger.  I find that the accessibility feature "temporary zoom" works great for allowing me to just momentarily pop a magnifying glass up to see the detail, then let go of the keys to go back to normal.

The problem is that I can't also interact with anything while the magnifier is up, because the shortcut for Temporary Zoom is ⌃ ctrl+⌥ option and does not appear to be able to be changed.  So whenever I click, I get a context menu instead of interacting with the underlying control.

Is there any way to map the Temporary Zoom shortcut, to something other than using ⌃ ctrl ?
I found a limited solution:
Install free BetterTouchTool from http://blog.boastr.net
Go to Gestures/Normal Mice, click Add New Button, set Left Click, check ctrl and option modifiers.
At right, choose Predefined Action called Mouse Click Actions / More Mouse Buttons &amp; Modifiers, and simply choose Left Mouse Button (see attached image). Save, close the BTT window, and try left-clicking. Unfortunately clicking is the only thing you can do, for example you can't click+drag (at least it didn't work for me).