Hi Pilou,

I'm glad to hear you again...

Well...as always it depends on what's your modelling goal.

But, in general, local editing and "control point editing" it's not the best feature of a Nurbs modelling package.
Also Rhino with its powerful MoveUVM command has a hard time in that type of things.
Very rarely Nurbs modelling give its best in point-modelling (or box-modelling).

So much so that for this type of task, exist very sophisticated software like Clayoo or T-SPlines, which mimic poly-modelling in a Nurbs environment,
but not always with very good results.

Best,

- Marco (mkdm)