+1 I'm having the same problem. Has anyone else out there encountered this?
You'd need to get the source for the manager application and modify it. Because of the overlap in functionality in some areas, and master control issues in other areas, the embedded Tomcat has missing functionality that the Tomcat management console either checks or accesses. I haven't heard of any announcements indicating work in the area. It may be possible, but I think the main JBoss work either now or in the future will be on functionality in the JBoss management application - jmx-console. Check at the JBoss SourceForge site I guess.