Ability to type 'Submit expense report by 3pm tomorrow' and have the task automatically be set with a due date for tomorrow at 3pm.
To extend this further, maybe typing +Zeb or @Zeb could also assign the task/reminder to Zeb.
(Refer to Todoist for some ideas on this implementation.)
Added from other merged posts:
* Ability to reference other known dates like "day before due date" or "due date -1"
* Recurring task with "every Wednesday"