It would be great to be able to add tasks directly in a quadrant!!
I mean: if I suddenly remember a todo for the day WHILE I am in the process of sorting today's tasks in quadrant view - I would love to click on the quadrant and add it directly!!!
App:
Web app
One way of doing this is using the Add Task button on the left and assign it a date this week. Not quite as user friendly, but it helps in the meantime.