Add missing attribute to the JBoss Web XML Schema

I have been reviewing all the XML schemas for all the subsystems, for my performance tuning work. In looking at the JBoss web schema, there is one attribute that I would like added to the schema so I can set its value.

You used to be able to set maxKeepAliveRequests in the old server.xml, and I would like a corresponding element added to the new AS 7.x schema. This particular attribute has been key in getting the maximum throughput on various workloads.