What more could we do?

Store credentials in a database such as mysql, or a directory service such as ldap so that we could associate additional meta-data about the user with the account.
Generate accounting data, so that we could bill for timed access to resources (at a wireless hotspot or a hotel for example).

Store credentials in a database such as mysql, or a directory service such as ldap so that we could associate additional meta-data about the user with the account.