tomcatAuthentication attribute on the AJP connector

In JBoss 5.1.0 I could set the tomcatAuthentication attribute of the AJP connector to false to allow IIS to handle the authentication and pass that along to JBoss. I'm wanting to upgrade to JBoss 7 but unable to set this attribute in version 7.0.0 final to make this work. This attribute is descibed in the tomcat documentation at http://tomcat.apache.org/tomcat-7.0-doc/config/ajp.html