I was delighted to see the Outline Feature of PaintedLine, but puzzled as to why this idea was not implemented on Paths or Taxiway lines. However, I hid my PATH taxiway Lines and overlayed them with Paintedlines set to ENHANCED_CENTER with trueAngle set to BOTH_ENDS.
The result was an enhanced lines with an outline at either end, but not in the middle. Switching this to ALL_POINTS created a contiguous outline, but now it is made up of straight lines between vertices.
The type of lines seems to be irrelevant, and I have tried this on more than one airport with the same result.