in order to use splines in RS you have to be quite organized about what you're building.. 
You're right, it's not the most flexible nurbs system. I sometimes wonder why it's (still) there when SDS can do the same and more. Imho nurbs would make sence if they could be used for precise, cad-like modelling รก la Rhino.
there is no deleting points and reconnecting them elsewhere.. sure, I can insert a new curve, but that thing is going to cruise through the whole model and create more density and detail where I don't need it, making the whole thing harder and harder to handle.  
If you build your mesh from nurbs crossections with the XSect tool and don't delete the crossections you'll be able to edit, delete and add points on the crossections wherever you like and the mesh will follow. Curves will be added through the whole model, as you say, but change in the shape of the model only take place where you planned them. Still, better use sds though.
 
Frank Bueters

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