Digging into Windows Server AppFabric tracking event collection service

There is no enough documentation for configuration of AppFabric Event collection service. The best doc I can find is this MSDN page:
http://msdn.microsoft.com/en-us/library/hh334438

We would like to fine control when workflow tracking events are being persisted. how ever, the document does not provide details of how extactly events are schduled to be persisted to the monitor datastore. The main configurable settings are the “eventBufferSize” and “RewriteDelay” attributes in root web.xml: