It would be great if the due date of the task was relative to the subtasks - I find I am missing seeing subtasks when I sort my list by due date, because my task due date isn't for a couple of weeks, but a sub task within that task is due this week. It would be good if the due date could be relative to the subtasks and update to the most pressing due date, once that's completed, it changes to the next - if that makes sense? Either that, or when you sort by due date, subtasks appear.