It would be amazing if it would be possible to duplicate a subtask directly from the task list, without opening in the subtask.
Let me give you a bit of background… I use subtasks to keep tracks of acceptance criteria and user stories scenarios. I normally like to duplicate subtasks that already contains pre-defined contents or subtasks; however, when I am in my creative mood I prioritise the ideas more than the process itself. Going in a subtask and duplicating it without being able to see the list of subtasks I am creating is not the best way to keep in the creative mood.
If I had the possibility to duplicate a subtask with a simple keyboard shortcut would save me from this.
BTW: currently I simply write a list of subtasks and then, when I am out from my creative mode, I merge them into properly duplicated subtasks!