I have an idea that you may already have thought of: A "filter" option,
which would set the position of each point to the position returned by a
macro that takes the original point as a parameter. That macro could be
redefined to anything the user wants, and applied to the entire mesh.

#macro SSSFilterMacro(point)
    (point * point.y)
#end//this could be redefined anywhere in the scene to do practically
anything


loop throught the points in the mesh doing something like:
#declare pointPos = SSSFilterMacro(pointPos);

Sorry if this is already in the SSS, I haven't had the chance to look at
it yet.

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