First - congrats.
Simple yet much much powerful and very much useful for me.
Second - I have a request.
Can you make a function to force update of the posts, so their thumbnail can be updated with the plugin?
If you can check the following plugin: Generate Post Thumbnails
It offers something like that, but it gathers the first image post and add it as thumbnail.
It would be great if Magic Post Thumbnail could auto/mass set the first Google image as thumbnail, I mean for existing posts.
Hope that this does not sound confusing and also it is easy to set up.
Best wishes for you and your family!