Under actions you have a drop down menu of i guess tools that actually do something. Could you put them in toolbar instead? Clicking on individual tool wouldn't open any sidebar instead it would be applied on the selection. When selecting control point controls from the current sidebar could be available as control point properties in the sidebar instead. Buttons that are currently used from the sidebar to move selection between control points can be added to separate toolbar.
At the moment the gui changes with every new idea. Pie menu IS the tool to make the interaction fast, so I will put functionality to it when it is ready,
at the moment I look for fast nurbs background methods and I have learned a lot last days. So I collect the news in my QComboBox for testing.
There is still a lot to do: basic operation on nurbs, shape generations, ...
when I have enough functionality to build my first car I will start with a better gui. But still it's useful to see the autodesk video to see what makes sense and how to arrange.