[squid-users] enabling X-Authenticated-user

I have an application that pays attention to the X-Authenticated-User
header. I need to use this application as an upstream proxy and need to
have the user authentication passed from squid through to this
application. I know about the login=PASS cache_peer directive but I am
wondering how that plays with negotiated authentication schemes like
kerberos. Is there a configuration item I can enable to get the header?
A bit of a search showed up nothing apart from some ICAP related stuff.
I cannot use ICAP for this application, I simply need the header. Would
the squid developers consider a patch if I developed one to add this?

-- 
Brett Lymn
"Warning:
The information contained in this email and any attached files is
confidential to BAE Systems Australia. If you are not the intended
recipient, any use, disclosure or copying of this email or any
attachments is expressly prohibited.  If you have received this email
in error, please notify us immediately. VIRUS: Every care has been
taken to ensure this email and its attachments are virus free,
however, any loss or damage incurred in using this email is not the
sender's responsibility.  It is your responsibility to ensure virus
checks are completed before installing any data sent in this email to
your computer."