Getting back to the Vertex Modeler, I often have trouble adding vertices. Droping one in the middle of an existing edge and creating links between existing vertices seems to work just great. Every now and then though, I'll want to add a point off of existing edges and link it to existing points. I use the poly line tool for this and then link the new point in as needed. Occaisionally this even seems to work, but much more often it seems that the new point has no influence over the model. Is this not the right way to add new points?