Infinispan's configuration files come with XSD schemas which means a rich UI for editing and validating these files should be easy to build. Further, each field could contain accompanying help text, including sample values, details of each field, etc. Again, all of this is available online and can be linked to.

http://docs.jboss.org/infinispan/4.2/apidocs/config.html
http://docs.jboss.org/infinispan/schemas/infinispan-config-4.2.xsd