I the idea is that for admin extensions you can hide their button from everyone but the other admins.This makes it easy to hide 1 extension so you don't have to create a group (or multiple groups) just to hide the admin button.
Thanks for the suggestion. I will take note of that. I asume that if you log with a hidden button extension, you might want to show it right? (So you can log as admin and see your own button).
Any update on this?I would also like to see this feature.