This is exactly what I missed and tried to accomplish by using pleexy and Todoist. I am very very happy with this feature in combination with linking notes to calendar items. A couple of suggestions:
I am using stacks to specify the 'area of responsibility'. I need a way to group tasks based on stacks, then on notebook and then on notes.
How about notifications of tasks and especially badges on tasks, and stacks/notebooks/notes with tasks.
I would like to see tasks of a specific date within the calendar apps (I use fantastical).
I would like to have widgets within Evernote and in iOS.
Attach labels to tasks.
Thanks in advance,