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The strategy proposed for implementing authentication in Sakai is to provide a proof of concept for the Sakai 1.5, Tomcat 5.0.28+, Apache 2.0, and Linux configuration (in progress). If this works, utilize this implementation for Sakai. At the same time, still explore the The possibility of using filters (as Yale/CAS implementation proves) as an alternativeServlet filters is no longer a possibility due to the inability to write to the RemoteUser.
A screenshot was provided as a mockup for the authentication model UI (login button replaces username and password textboxes in SiteNavServlet).