qmail-ldap's smtp-auth -> more info for failures

Hello.

I'm trying to get qmail-ldap to write more info to
the log on an "authentication error" in the smtp-auth
process.

Actualy qmail-smtp only logs the failure without
giving more infos. It would be nice in cases of
support calls to have the username a user tried
within the failure notice, like it is on a success.

Any knows of a patch for that?

Greets
Phil.