The ability to save each and every email that you select and to do so from pre-set parameters (in settings) such that manual naming becomes void.
It would enable uniform method of saving & naming of each email.
eg: Date ; Time ; From Addressee ; To Addressee ; Subject Line
Sample: 2023-06-13 15.08.48 - Mike Davis MDavis@yahoo.com - abc@protonmail.com - Time to meet tomorrow

Users could then order these as per their desire notwithstanding that date/time would be logical initial parameters. So it could be changed to any format.... Date ; Time ; Subject Line ; To Addressee ; From Addressee

This feature would then automatically take data in the order selected from the email and inject that in the save name box without needing to type anything.

To overcome issues you could have in settings a check box to select for all emails. This would then by default apply the users pre-selected naming instruction format. You could then by typing in the box over-ride this default setting if needed.