Team,
I figured out how to add additional web service perfmon performance metrics. I added the following line to perfmon configuration section against Interscopeagent.profile which will added Web Services metrics containing key work "Current" which includes Current Connections..etc against the default web site.
introscope.agent.perfmon.metric.filterPattern=|Processor|*|*,|.NET Data Provider*|*|*,|.NET CLR*|{osprocessname}|*,|.NET CLR Data|*|*,|Process|{osprocessname}|*,|ASP.NET*|*,|Web Service|*|Current*|
Let me know your thoughts on this approach.
Also, please forgive my typos if any.
-Richard