In my shul the official nusach is Chabad. The rabbi is Chabad too. Most of the congregants are not Chassidic and they are used to daven nusach Sfard or Ashkenaz. My question is: is the shliach tzibur allowed to skip paragraphs that are not in his nusach? I asked the rabbi, and he instructed me to tell the shliach tzibur myself, privately, that he's skipping. The rabbi does not want to antagonize anybody, in order to keep congregants content. When I asked the shliach Tzibur, he smiled and said to complain to the rabbi.