Browsing through the "Controls" documentation I noticed that the picture used for extending the configuration is not best practice since it's using relative paths. We will only be using absolute paths for the migration and further on (not sure what they plan on doing with the site configurations).
I have attached the same version with the absolute path in it.

However, while this is best practice, it might not be clear enough for the user to realize that it is extending the tab within the dialog from above.
So either make sure that people know that relative paths are not best practice, or use the attached picture explaining that it is using the absolute path to extend the tab from above.