This is good stuffs toward managing cluster elements. Can you also take it further along the line of jmx remote call (like twiddle) to provide querying and active management (leave and join)? It is not just jmx since we are talking about aggregation here.
Yes, operations are planned (e.g. view reconciliation).
Problem, though: this is part of JGroups, and we don't enable JGroups in the default JBoss config.
So maybe we have to replicate this functionality in JBoss, e.g. as an MBean. Hmm, maybe Remoting already provides such a functionality, I recall they had some sort of multicast discovery going on...