Hi Phillip,
you are correct, the free SNC solution needs a Kerberos integration to verifiy the systems and to get the tokens for encryption. Is there any reason for you not to make use of Kerberos?
With regards to the documentation, the links you refer to are from different products and features all not related to the free SNC solution. The closest match would be the Secure Login Implementation Guide, although this does refer to the SAP NetWeaver SSO product and NOT to the free encryption only SNC solution.
The correct documentation can be found in the SAP Help portal only.