I think gold dragons would at least have respect the laws of mortals. Even if they don't necessarily agree with them. That respect and consideration to others is a sign of goodness, at least for me.
Like if you are belonging to one religion, and you respect another person for their religious traditions, even if you don't agree with all the details -- that to me is some mix of goodness and lawfulness.
As I said elsewhere, for me, D&D is an escape from reality. Goodness actually means something in fantasy heroic genre. For me, it degrades the whole point of alignment if lawful goodness is diminished in the way you suggest.
(Not that I am a huge fan of alignment, but I'm just working with what's in the game)