Is there some way of configuring JBoss AS SSL server to only accept a specific subset of cipher suites ?
Yes there is :)
Tomcat as a connector flag named "cipher" (or something like that) for that purpose. see the SSL connector docs for details.
Furthermore, JBoss 4.0.3 was enhanced with exporting of all the SSL Socket Factory api configuration parameters, ciphersuite being one of them. check http://jira.jboss.com/jira/browse/JBAS-1983