I'm sure it is availble, but I didn't see how to take a task and duplicate it.
If this doesn't exist, please include the (optional) ability to duplicate any files attached to the task as well, or the (optional) ability to maintain a link to the existing attached files.
Ideally, the interface would allow you to duplicate all but certain fields, which would be added based on a query to the user, or calculated according to some user-defined formula.
The (optional) ability to clone subtasks would also be useful.