The ability to see and check off tasks from the calendar view. If jobs have tasks still to be completed, you won't know that unless you click on the quote/ invoice on the calendar. If those appeared at the bottom of the job status window on the calendar, you would be able to scan and see what task are still undone. I think it would be very helpful in the mornings when planning how to start the day.

This would help reduce times you need to open the job up completely.