If we have a task with a lot of sub-tasks, the new sub-tasks are automatically created at the last position so if we want to move it at the top, we have to click several times on the up arrow. Being able to specify which position we want to move the sub-task to (like for the fields in the screens) would make it much faster. If that's not possible, at least having "move to first position" and "move to last position" arrows would also help greatly.