One single flipped bit ought to be all it takes to turn milestone roads from infuriatingly troublesome to use, to bring considerably less troublesome. You can replace the graphic with a large cobblestone or something later - I won't mind walking through road-pillars if it means I don't have to zigzag around wildly anymore.
Forum search turned up this suggestion nearly a year ago, with someone paraphrasing loftar thinking it was a pretty good idea. Just leaving a reminder for the devs that people still care.