For all of you developers, who think that switching to the package explorer view to access the faces-config.xml file is annoying, should read this!
Just found this little thingy in the preferences of Domino Designer 9 to have a direct access to the faces-config.xml file.
Open the preferences and navigate to "Domino Designer, Applications Navigator". Tick the entry "Application Configuration" twice so that the checkmark will appear.
Close the preferences and et voila: you can open the file without switching to the package explorer