It would be cool if you could enter a start date for a task. That way if you had a start date, duration, and due date, you could enter in two of the three, and ClockingIT could interpolate the other automatically.
For example, you could put in September 9 in due date, and 3 days in duration, and it would automatically interpolate a starting date of September 6. Or you could put in September 6 as starting, 3 days duration, and it would automatically put in September 9 for due date.
This would be helpful to know when you should begin a task, and give the users notice when they should begin.