Feature request: Please refer to the chart I have attached. What would make Pro Sites really useful would be to have a page in the plugin administration that would display this table as a control panel to set capabilities. The plugin would expand the top axis as levels are created, and expand the left axis as capabilities are defined, and then replace the "x" values with check boxes (or text fields as appropriate). Dragging and dropping the capabilities lines would make it really easy to see and work through the relationships.
I'm not thinking about a chart but a control panel laid out like my chart.
A "capabilities" tab and a "assign capabilities to levels" tab would need to be added to the Pro Sites sub menu to facilitate this. I think this would be really valuable for many different projects.