Add time entry and time burndown for tasks
Allow time to be added to tasks, then a 'Time burndown' can be viewed along with the point burndown. This gives a much clearer picture of work that can be done within a sprint (which is a 'time'). Then when a task is being worked on, the user can update the time.
Ex: 2h of 4h (if he spent 2h on it today, and the total estimate was 4h)