tasks due date trigger for planner

[EdmundSq]

It would be very useful to have a trigger based on a user-defined length of time before the due date.  For example, Mike has a task due in a week.  I can have an email automatically sent as a reminder every day until he completes the task.  While this is currently a feature in Planner, the user has to opt-in to it.  I would like to force the notification.