I'll need to get info from dev about this, but the JBoss management doc should be enhanced to: 1. Cover how to create a cluster (if possible) using JON. 2. Manage a cluster.
I think this is the doc to reference, for the AS7 configuration part: https://docs.jboss.org/author/display/AS71/AS7+Cluster+Howto
Bumpt to 3.1.2.
The cited wiki page seems to be very much outside the scope of JON management. I am closing this as WONTFIX.