What is the ruling on a Shafi'i congregant praying behind a Maliki imam who does not recite the Basmala aloud in a prayer of audibility, and is it permissible for the Maliki imam to recite it aloud to accommodate the congregants?

It is permissible for a Shafi'i congregant to follow a Maliki imam, even if the congregant believes that the imam has omitted an obligation, such as reciting the Basmalah. The congregant's prayer behind his imam is valid. The Maliki imam may recite the Basmalah aloud before the Fatihah in the obligatory prayer to reassure the congregants.