I would like to be able to convert a task to a subtask by dragging it onto a task, holding it for X seconds, then dropping it (like adding a file to a folder by dragging it over the folder). It would making organizing tasks more efficient, and get around the limitation where only 9 options display when typing in a task name when working to convert tasks to subtasks.
That sounds intuitive. I like the idea. 
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How is this not a thing already? Seems so basic!!