I don't know about namecheap, but I used to use some other registrars that had the option to either forward all requests to the root folder OR keep the directory structure intact. It looks like that should be possible with namecheap, but I'm not sure. See if there's anything new here:
http://namecheap.simplekb.com/Themes...7&categoryid=4
http://namecheap.simplekb.com/Themes...4&categoryid=0