This is so far only available in jboss-head with jboss-5.0.0alpha
Once jbossws-1.0 is released there will be a backport to jboss-4.0
And what is the current time frame for both JBossWS-1.0 and the backport to 4.0.x?
The jbossws-1.0 release depends on a full pass of the CTS and sufficient wstools support.
Checkout JIRA for the current status of that release.