Hi Phil.
tested ans very good... a little bit for Future at tool...
Taxiways:
The easiest solution would be... I think... with taxiways.
Insert a button in the task, example building button for Taxiways, there a mask with different finished flat courses, in each case 1x 30 degrees, 1x 60 degrees, 1x 90 degrees, 1x acute angle for 90 degrees around a surface or a straight course to add. As well as various straight pieces and surfaces.
The whole perhaps still in two texture options, tar and concrete surface.
The width would be variable as with the runways.
That would be a modular principle.
Or free polygon selection with Lines Button for yellow follow line.
Please no grid like in AC3D...this is much too complex and does not go well in curves. Too much work.
Unfortunately, not all buildings can be added exactly in parallel
Some no problem and some with 1-2 degrees difference.
Regards.
And many Thx for that tool
ULI