Create option to send notification emails when a CTA or task is due instead of only when it's create

At the current moment, when enabling daily notification emails, you can only set it so that when a CTA or task is assigned to a person that an email gets triggered.  I'd like the notification email to go out when the CTA or task is due.

The way it works now is akin to a Doctor calling to remind you of your appointment the day after you make it instead of the week it actually occurs.