That does it, thanks.
I found it mostly nice (although occasionally interfering) when the default zoom trigger was a mouse-hover. Otherwise, without special instruction, most students will not ever be aware of the capacity to zoom. Is there a way to change these defaults in a config file? Will changing that particular default interfere with assistive technology like a screen reader?
Also, would there be a negative to setting the default math rendering to MathML instead of CSS HTML? I believe our screen-reader experiments were only successful with IE9, MathPlayer, and MathJax set to MathML rendering. So if there are no down sides, it would be nice to make MathML the default.