Here is the code that I would expect to draw a path with a dotted line using the stipple parameters.
var orbitPathArray = <some positions>
var orbitLayer = <a layer>
var pathAttributes= new WorldWind.ShapeAttributes(null)
pathAttributes.outlineStippleFactor = 1;
pathAttributes.outlineStipplePattern= 0xF001;
pathAttributes.outlineColor=WorldWind.Color.WHITE;
pathAttributes.drawInterior=false;
var orbitPath= new WorldWind.Path(orbitPathArray, pathAttributes);
orbitPath.altitudeMode = WorldWind.RELATIVE_TO_GROUND;
orbitPath.useSurfaceShapeFor2D=true;
orbitLayer.addRenderable(orbitPath);
The path renders a white path with the indicated positions, but no dotted-ness is present. I have tried a variety of different stipple patterns and factors but nothing changes the path's appearance. Looking at the source, it seems like this might not yet be implemented.