Most of the information is kept in the MBean jboss.web:name=http-127.0.0.1-8080,type=ThreadPool (IP address and port number will vary), but the wait queue depth is not tracked.
I think request queue size is one of the important metric we can use to understand the system load especially for high-traffic applications. I'm that jboss/tomcat does't expose this information in the mbean. Hope it gets added soon.
Thanks for clarifying Peter.