mswin_ntlm_auth specify default domain

["Ryan How -I.T. HEROES-" <ryan@xxxxxxxxxxxxxxx>]

Hi,

I'm using mswin_ntlm_auth to authenticate users and it appears to be 
working correctly.

However, when a non-domain users accesses the proxy, or if using firefox 
for example, they get the login dialog (which is fine) and they need to 
enter their username in the form DOMAIN\user . Is there any way I can 
specify the domain in the config somewhere so they don't need to enter it?

I am using the basic mswin_auth as a fallback. I do not need to enter 
the domain in when using this. But it only pops up after I click cancel 
on the NTLM auth dialog.

Many thanks,
Ryan