In an Aug 15 entry I wrote about how you could configure the built-in web server in CFMX to support your accessing code outside the built-in wwwroot. There's a very interesting article in the MM support center, Configuring the Macromedia ColdFusion MX built-in web server, that goes into much more detail on this and more. Definitely worth checking out.
Indeed, note that they show an example of configuring a virtual mapping for \* which can effect a replacement of the location of the default webroot. I had discussed it just for adding additional paths outside the default root. Clearly, both uses have their place.