3ds Max like softselection/proportional editing with surface based falloff

In 3ds max using softselection theres an option to toggle which switches softselection from volume falloff to surface length fall-off.

its always been one of the most useful things in modelling in 3ds max. becasue you then can edit only one side of a mouth/eye/whatever proportionally.

the toggle to affect backfacing faces is also very nice.

would be nice to have it in blender