Expanding the queries natively available in Data Explorer would certainly be very helpful and accessible for a lot of admins/users.
However, I believe there also exists a need for ‘second tier’ queries, and a structured place to discuss them. I come to meta looking for a solution to a problem I have, not to donate clever queries per se.
Perhaps @sam’s and @Johani’s approaches could be combined? A subcategory with some topics/queries tagged as ‘official’ which are bundled with the plugin.