Mr Roxy, yes, Starmites received a nomination for score and Mack & Mabel did not, but they weren't in the same year so you can't really say it got a nom over M&M. The Lieutenant and Letter from Queen Victoria (pretty much anything they could find) were nominated over M&M.
I can only assume it hasn't been mentioned yet because too few people saw it to remember it almost thirty years later: THE KNIFE. In which Mary Elizabeth Mastrantonio told Mandy Patinkin, "the way you looked at me you could have been a woman", and he proceeded to become one.