I have found that the version by mheder on github (https://github.com/mheder/liferay-shibboleth-plugin) also implements very useful features:
-auto create users using Shibboleth attributes (email, first name, last name)
-auto update user information upon login
-added options to specify the headers (Shibboleth attributes) to be used for extracting email, first name and last name
-basic attribute to role mapping
-auto create users using Shibboleth attributes (email, first name, last name)
-auto update user information upon login
-added options to specify the headers (Shibboleth attributes) to be used for extracting email, first name and last name
-basic attribute to role mapping