I want to be able to create a template checklist like, say "Travel", and the first task in the list will be "Target Date" or something like that. When I set other tasks in the list, they will be able to be set to "Target date - 2 days" (and so on). Once the target date gets set to a real date, all the task dates automagically populate with real dates, relative to the now set target date, and you start working your list!