Currently, one can create an Action Card template with Sub-Actions that can have relational dates like: 10 days before Action Card due date or 30 days after; which automatically adjust to the due date of the Action Card when that template is applied.
It would be very helpful for Approval Templates due dates to do so too. In other words, when an Approval Template it applied, it should adjust the due dates for the various Stages relationally to the due date of the Action Card (based on parameters specified when that Approval Template was made.