mijalis, thanks for your feedback. We just added a duplicate task feature -- while not quite the same, perhaps this would help?

We still need a duplicate list function, it's really fussy trying to duplicate a long list because you can only select a certain maximum (25?) number of tasks and it's annoying trying to remember which ones you have already copied and individually selecting subsets of the list to copy.

@emily Yes, please add the "duplicate list" feature as well.