Question: Is it appropriate to recite the T’hilim perek of “Shir HaMaalos MiMaamakim” after Yishtabach during the Aseres Y’mei T’shuvah?
Short Answer: There is a dispute whether Shir HaMaalos MiMaamakim should be recited after Yishtabach during the Aseres Y’mei T’shuvah. Shuls should follow their own minhag.
Question: Must we specifically recite ten p’sukim for Malchiyus, Zichronos, and Shofaros?
Short Answer: There is a dispute in the poskim whether we need to recite ten references each for Malchiyus, Zichronos, and Shofaros (even if one pasuk contains more than one reference) or if we specifically require ten p’sukim (regardless of the references therein).