Drag-and-drop is one of the most time-saving features! And now you can use it in 2 Runrun.it areas.
To prioritize tasks, just click next to the flag and drag the task down or up, depending on the priority you want. Then just drop in the place it should be.
To attach files to tasks, click on the file and take it to the retangular area inside the task. Drop there and save time!