Teachers need to be able to create and/or edit multiple assignments at once.  Similar to the way they can now edit due dates, they need to be able to edit other parts of the assignment (title, points, assignment group, etc).  But more than that, if they know they will have 5 assignments in a module, they need to be able to create all of those assignments at once to save time.  It's way too many clicks to create/edit assignments otherwise.