Passwords for users in gnatsd.access

Folks;

I've figured out how to work the gnatsd.conf vs. gnatsd.access relationship, but I have a question.  

Has anybody set up things so that the gnats administrator doesn't know the existing passwords for users within gnatsd.access?  Ideally, I'd like to refer to our NFS server's password file, which has jumbled the passwords into something even we system administrator's don't know.  The users will want to use the same passwords for their general accounts, and I don't like having the passwords be as is within gnatsd.access and thus available to anyone who can crack the file.

Thanks,
Rich Erwin
Boeing SSG - M&CT Support
(425) 865-3414