If you're doing heavy "curvature forms", it can often be a sign that you would be better off using a toolset that is more heavily oriented around organic form modeling like polygon sub-d modeling, rather than using NURBS modeling.

NURBS modeling is generally at it's most effective when you're doing more mechanical shapes that are more strongly defined by 2D profile curves and have cut away areas. Organic models frequently do not fit into that category and generally work better with the sub-d modeling toolset instead.

So that's why that kind of modeling has not been a major focus for MoI, because there's a different kind of toolset that is generally more oriented towards doing it.

I do plan on improving various aspects of curvature continuity in MoI in the future though, but really if it's the main kind of thing you're focused on a sub-d modeler is probably just a better fit.

- Michael