There is no default root context for the JBoss bundle. You can try the consoles provided with JBoss 3.2.x.
The configuration for the web container is located in JBOSS_HOME/server/default/deploy/jbossweb-tomcat41.sar/META-INF/jboss-service.xml or similar for the JBoss 3.2.3 bundle for the default run-time instance. The configuration directives are a subset of the service.xml for the standalone Tomcat.
The paid-for-documentation covers more in-depth information. You can find some information on JBoss configuration in http://amitysolutions.com.au/downloads/response_tester.pdf although much of the information is devoted to configuration for an application.
Hope that gets you a start.