It would be great to be able to assign individual tasks within a task. For example, if you have a group of people who must perform tasks in order for another task to be completed, you should be able to assign different elements of the task checklist to different people. This would also be useful if multiple people need to execute on the same task list activities for a commonly assigned task. Having task list specific start dates, due dates and end dates would also be great. Come to think of it, a completion (end) date isn't shown at the task level either.