This is something we used to have when editing our lists, and it was incredibly helpful, especially when adding multiple titles.
I order my lists by year and then alphabetically. Currently, I have to make note of where a title needs to go (before/after a specific title already on the list), save, and then repeat, repeat, repeat.
Being able to add and order/reorder everything in one go (before finally clicking Save) would be a much appreciate time-saver. :)