I didnt know a lot about patching*** seems a problem around cad modelling ! as rhino, as surface sufferers from it (a lot of time spending on patch making)
a good tool for moi will be ~ ogl - other shaders and better patching tools (from what I've watched) - u have any extra )))
ps: I'm asking a pro for wishes xD as I'm a poly-surface modeler - what & where cad can improve ))
as for poly modelling I partially disagree, there's OP tool for blender mira tools, that could handle polys under curve