The nice thing about using the painted shader is that you can follow features in the terrain that would host a pathway. Just move up closer in the preview, freeze it and start painting (right size brush). Then unfreeze, move to next area to be painted in, freeze preview again and carefully paint on. Freezing the preview is safer than painting in refreshing mode, as it may easier crash (at least that was the case in previous versions of TG). I also pay attention not to paint too close or over the edge of the preview, which also caused some crashes earlier.
I used this method to paint water streams from mountains too.