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@Brock note that it interferes with your kbd buttons, so you may want to disable it(my script). Otherwise the buttons will be useless (keyboard shortcuts won't be, though)
@Brock I have a working version used in stackapps.com/questions/3373/mathjax-buttons. This can be easily extended--add your kbd handler to the //methods section. (via window.kbd=InsertKbdTag, where InsertKbdTag is the function copied from your script), and add an entry to buttonconfig
