I'm working on a Behavior that will allow you to draw the outline, or fill the Terrain in your Scene. You can already do this (partially) using debug drawing, however this turns on debug drawing for everything and it only draws the outline.
This will allow you to specify the stroke color, stroke size, and fill color. I'm still working out a few drawing issues where some of the shapes flicker. If I can figure that out, I'll upload the Behavior soon.
The only other issue is that the polygons composed of multiple shapes show each shape's outline drawn separately (when using a stroke color). I'm trying to find a way to make it draw as one shape, although I'm not quite there yet.