That sounds fantastic!
While you’re in development, I might as well ask for the sky: is there any way to highlight the information that’s changed in the listing? Thinking of how we would be using the add-on (for notification of changes) it would be extremely helpful for the person entering the information in the off-line database if the changed information was highlighted or marked in some way so that they could tell that only the phone number was changed, or the zip code and phone number were changed.
Not sure that’s even possible, but I thought I would ask.
Let me know if you need a beta tester.