Discussion of changes to the core of tomcat should be happening on the tomcat dev list, not here. It would only be revelvant here if they told you to get lost and wanted to pursue a jboss specific integration.
I moved the discussion to the Tomcat dev list as suggested. The initial response that I got was that the enhancement wasn't needed. I need to figure out if they are correct and if so how to configure Tomcat 5.5 to reduce concurrency. If I'm correct, I'll need to explain better the idea of reducing concurrency and how it can be done in Tomcat. I'll also need to submit benchmark results showing the improvement.
I hope that I am wrong as that would mean better performance can be obtained with the current Tomcat 5.5 release now :-)