When you are in the Teacher Cover Timetable section and you want to apply cover to a lesson, the headings at the bottom of the screen (i.e. for Cover Rota, Free, Subject and so on) are clickable, meaning that you can change the sort order for the listed teachers.
This is a really helpful feature as the default sort order doesn't always reflect what you are trying to do at that particular point in time.
It would be really great if the same feature was available for the Free and Scheduled tabs on the Room Cover Timetable section.