@ac.afd the problem with trying to add more to the sidebar defeats the point of it, the sidebar is by nature supposed to be the bare essentials, the basics. It’s appeal right now is that it’s easy to understand, the more that is added to this area the more complex it will become and ultimatly the sidebar would just end up looking like the class editor which right now is more work to use in your opinion.
Getting the right balance is hard work, but it’s not impossible. That said Blocs will only ever do the basics in the sidebar, the class manager and editor offer vastly superior control of objects in a site and are well worth learning, they are basically like layer styles if you come from a graphic design world.