I don’t believe that any gedolim, other than the Lubavitcher Rebbe, in past years, has addressed issues of morality and sheva mitzvos for goyim. I can provide the source, if you’d like. The sicha is probably on the internet, although I am unsure.
(I am not stam a Lubavitcher, by the way. However, it is the Chassidus with which I am most familiar, and I have tremendous respect for the Rebbe, whom I believe to have been one of the gedolei hador).