The ability to bulk add tasks would be amazing. In other project management tools the ability to add multiple tasks at a time was available.

Say for instance, a client sends you a list of to do items as a bulleted list (or ul in html). Being able to copy said list and paste into a bulk edit that could treat every line (or li) into a task would mean it would take under a minute to add 10 tasks as opposed to half an hour of careful copy/pasting.