Propagating multiple extrudes works right now. (That means that modifying any parameter will update only the geometry affected and its dependencies)
Another crash is fixed due to what the dependency handling naro code will not crash in case one shape is invalid in a chain of dependencies.
Also the side effect of flickering updating all changes is done using a guard class (because IDisposable interface is not called in a predictable way, the user should explicitly call the view but in a much smaller way).
Combined with bxtrx fixes which improved the speed greatly, right now Naro is a much more pleasant application to use.