fallback authentication

I've configured PostgreSQL (8.0.0beta5) to do ldap authenticatation via
pam for connections to localhost.  My hba.conf looks like:

host    all         all         127.0.0.1         255.255.255.255   pam

My pam.d/postgresql file looks like:

auth     required     pam_ldap.so
account  required     pam_ldap.so

This all works great.

Sometimes, however, I would like to create an account in PostgreSQL
which I do not want to also maintain in LDAP.  Is it possible to
configure authentication to fall through to a different method?

--
Ron Peterson
Network & Systems Manager
Mount Holyoke College
http://www.mtholyoke.edu/~rpeterso