Thank you, that worked like a charm for most of my directories--with one exception.
I have a another WebDAV enabled directory, /dropbox, exisiting at the same level as the others. This directory was password protected (for read) and loading it would bring up a password prompt.
With the rewrite functioning firefox simply says "Firefox has detected that the server is redirecting the request for this address in a way that will never complete." I can still access the directory as a web folder, and if I turn off the "password protect this directory" option in DH control panel I am able to access/read the directory with no problems.
Is there any way to preserve the password protection with a rewrite in place?