Allow a Team administrator to have a master setting that allows all notifications to be set to default turned on or off across all the channels in the teams - rather than setting up individually by each channel. This could still be an option, but for users using Teams with multiple channels and wanting notifications for each channel (I'm a teacher and I'm using Teams for students to submit assignments, and then to give feedback on the assignments), it would be useful to be able to have one master button that says all channels in this Team will automatically have notifications turned on.