There are currently two columns in the "Document List Panel" (as it is called in the Preferences/General tab) or the "Doc Switcher" (as it is called at the top of the panel itself): file name and file extension.
By clicking on the column header, the list of open files can be sorted by name or by extension in ascending or descending order.
However, when editing many files over a long period of time, the list becomes very long.
It would then be very useful to be able to sort by the "date edited". In the case when one knows that a file was edited recently but cannot find it in the list, by sorting the list in "date edited" order, the most recently edited files can be listed at the top - or bottom - of the list, making it easy to find them.