Ability to add the same task to multiple days for tasks that take longer than a day

It would be great if I could drag a task onto multiple days if I know it's a several-day task. For example "Grade papers" can't be done in one day, and it doesn't make sense to write "Grade papers day 1" and "Grade papers day 2". I want to be able to put this task on several days, and then have a special task called "Finish grading papers" on the day I need to be finished.

I almost consider this a bug because having all your tasks in that area down below sort of implies that I can drag them out and put them anywhere. To me, it's sort of "expected behavior". I was really surprised that it seems if I drag a task to multiple days it just moves the task. I hope you'll consider allowing this.