@Addison

First, it is just a little bit more convenient to use a single key, when I work with my external keyboard. The eject button is very easy to access; however, Ctrl+Escape (which also works on my external keyboard) is not too hard neither.

Second, switching to the previous window can then be done with the Ctrl+Eject button easily. I do not need the switching backwards functionality when I use the N810's hardware keyboard only, as then I tend to work with fewer open windows.