I actually like the borders, at least some kind of divider between the addon name list & the panel.
But if were making suggestions the one thing I would really like to see is the ability to register sub-panels. Something like when you click on an addon name the list updates & you get a list of sub panels for that addon under it, rather than being restricted to only using sub menus.
Something like this:
When setting something to full width, checkboxes for example, it would be nice if the ON/OFF aligned to the right of the panel to allow for longer descriptions, no since in wasting that space. If were marking the control for full width it should be full width, not 60% width, in my opinion.
