DrByte:
v1.5.0 added built-in profile support, along with a number of improvements beyond what the "Admin Profiles addon" offered.
Refining it to granularly control every word/button/section of every admin page is a large job. Chances are that any more-granular control added will be fairly broad or generic in order to suit the largest possible audience without impeding usefulness or comprehension of options.
Thanks for taking the time to explain it. I could not imagine the work that would be needed to make foolproof.
I will try to give a short explaination of what I think would be a little simplier way to acheive this idea. I just hope that I can do so without making a fool of myself.
I would replace the Category/Product checkbox (when adding a new profile) to a dropdown. If a category was selected there, a session variable would be set. That variable would set the Category/Product button in that session so that when clicked, it would be the top level category and that user would be directed to that category.
A potential issue could be if the admin user tried to copy or move a product to another category.
This could be easily fixed by adding a second admin (solely for the secondary admin users) and then replacing the Move and Copy gifs with a transpixel gif so those options are not available on their product view.