one can propagate a weight map using this python tag
there is also another tag which simply inverts weights (1-x)

project file: dl.dropboxusercontent.com/u/28585409/weight%20map%20propagation.c4d
v2 (with speed control): dl.dropboxusercontent.com/u/28585409/vertex_map_v2.c4d
v3 (some bugs fixed):dl.dropboxusercontent.com/u/28585409/weight%20map%20propagation%20v3.c4d

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