This is basically a request to add https://www.drupal.org/project/admin_menu_source into Backdrop core:

This would be a nice solution for what this person is trying to achieve in https://forum.backdropcms.org/forum/flyout-menu (aside from the vertical placement of the admin bar).
This is one of the things I'm planning to discuss during the Content Author-centric UX improvements in core session in the upcoming Backdrop Live event.
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@themetman Good to hear your solution. May be helpful for others in the future.
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