I got the beta and installed it with no problems. The feature works exactly as I expected it would, thanks! The only feedback I have is, you should work to add this feature to your next release, it’s very handy.
Maybe a bit more complex, but having more options on what to display or not could improve this even more. Also you could add a feature allowing users to choose to not allow parent categories to be selected, and a shortcode to remove the “Show all categories” option.
Thanks again for taking the time to add this feature for me. I’m very pleased with the plugin, and the support you offer for it is unparalleled.