The wonderful thing about Kangaroo is that many “natural” phenomena emerge from simple definable goals and iteratively solving for minimizing energy (my very crude understanding). Along the “stack of equal weights” (verts) on the polyline, you can see that the lower you go, the closer together they get, as expected IRL:
aerial3.gh (18.4 KB)
But I do share your desire to be able to assign different masses to points in a polyline. This thread might shed some light, with a great explanation from @DanielPiker (the creator of Kangaroo). And here’s more.