In my workflow, I often minimize subactions so that they get collected in tabs in the bottom right corner. These are my active/open tasks, and I find that's the easiest way to get from point A to point B as a user currently. Adding the ability to then drag those tabs into a different order like the tabs in a web browser would be ideal. This will improve my ability to organize my tasks in this manner better, as currently the tabs are ordered by the order you minimized those subactions. If you wanted to have them in a different order, you'd have to close all of them, and then revisit the subactions and minimize each of those subactions again.