For a long time a command has been requested that allows to realize a variable offset.
For example, I would like an offset in which, at a point A (defined by the user), there is a greater distance from the curve (doing this with the modification points on is very convenient).
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Yeah, this has been on the wishlist for a long, ling time - I think since V3 - and we still don’t have it yet. the workaround is to extrude the curve, use VariableOffsetSrf on the resulting surface, then DupEdge the edge of the offset surface. A variable radius pipe with isocurve extraction is also a possibility.
–Mitch
Alternative as possible, but a little laborious, especially if the points become too many …
We’ll wait for Rhino 10 … (maybe) … 
BUMP!
VariableOffsetSrf must be more complex than an equivalent for VariableOffsetCrv. Surely it can’t be beyond expectations to have this tool available.
It would be neat if it could work as seamless as this new variable offset surface in Alias:
