Any plans to add this feature?
What are you trying to do? Are you wanting to load phake inside your application and run a task?
Exactly. I was also thinking it might be nice if you'd like to run a task within the context of another task.
To run a task inside another task you can call invoke() on the \phake\Application instance that's passed to the task body.
Addressing the former case would require a fair bit of code reorganisation. I'll have a look at it over the next couple of days.