This is something that we're having an issue with, we don't use path mapping in our studio. I'm really not sure I understand why this isn't supported? Every other package we use (Maya, Max, Houdini, Photoshop, Zbrush etc) can handle this kind of thing so it shouldn't be a problem surely?
The help page says it's because it requires authentication and the software can't do that, how are the other programs doing it then?