I search for this and couldn’t find it here already.
I think it’d be great to be able to build a template that doesn’t have due dates but instead has how far out from the date of project completion that due date should be. So, if I have a project template for an event, I put in the event date and it automatically puts due dates on all of the tasks based on that info. So, order flower arrangements always needs to happen about 20 days out. When I assign the date of October 27 for the event, the flower arrangements task gets a due date of October 7th by default.