Pushing a usable extension editor is my current Idle priority since the lack of one more or less blocks several other issues.  The two big problems with the Feb 2014 patch are the actions buttons at the bottom and the true/false options.

I moved the cureent, apparently working ConfigDialog action button code into a new method that I believe can be re-used in ConfigExtensionDialog with
    create_action_button = ConfigDialog.create_action_button
I nect incorporate this into the patch. (I pushed the change already because it makes the existing code clearer and easier to modify, by disentangling page code from button code.)

For binary options, I will use radiobutton pairs, as with ConfigDialog, if I cannot easily get a single button to look nice and work correctly.