Make sure to watch the logs as you start up after making those changes. Address any errors CAS throws while it starts up. Also, I'm not 100% sure of the state/version of the cas-web WAR that Liferay provides. We run a build of CAS directly from JASIG, usually built from source to fit our exact needs. There may be a SAML add-on of sorts that isn't available in the bundled version you're installing with Liferay. In that case, you're best bet may be to try and set up a standard CAS server standalone. You can still run it on the same JVM as Liferay, but it won't be hot deployed.
If that is what you want to do, the JASIG forums and documentation are going to be your best mode of support.
Firmi prego dentro per inbandierare questo come inadeguato.