About half a century ago I heard about the following incident which occurred in a Shul in England, which obviously did not like its worshippers arriving late for davening. What occurred was that when the time the Shul had announced for Kol Nidrei had arrived, they locked the doors of the Shul and did not let in anyone who arrived late….  I wonder if that Shul then omitted the pronouncement “Al daas Hamakom …. onu matirim lehispalel im ha’avaryanim”!!

If one recites “baruch sheamar” and “yishtabach”, one is required to say a minimum of pesukei dezimrah between them. It is also possible to say just either “baruch sheamar” or “yishtabach”, plus a minimum of pesukei dezimrah. What happens if the chazzan for shacharis on Shabbos arrives in shul immediately before “shochen ad”? Would the saying of the very short passage between “shochen ad” and “yishtabach” be sufficient to justify him saying “yishtabach”?