We've added useful little thing to tasks and you may be pleased by it πŸ˜‰, you can now add a "to do" to any task:​​

to do in tasks - detail

You can add "to do" at any time from the task details or when creating a new task or editing an existing one:​​

to do in tasks - form

I believe that this feature will help you get a bit more from tasks πŸ™‚