Could the option be added to set each list individually that completed tasks would be deleted? This would be especially helpful when you have a task that is repeating. As every time I complete a repeating task it makes a completed one and a new one for the next iteration.
I like some lists so that completed items can be unmarked as completed and added back into the list, like for shopping for repeatedly bought items and other lists where it is a repeated task, but don't need to see the old ones that I marked as done.
