1. A method of processing in a data processing system, said method comprising: receiving a simulation model, said simulation model including a plurality of design entity instances modeling a digital system and one or more instrumentation entity instances, separate from said plurality of design entity instances, that generate instances of instrumentation events for testing purposes during simulation; and in response to receiving an exclusion list identifying at least one instance of one or more instrumentation events to be removed from said simulation model, removing said at least one instance of said one or more instrumentation events and associated logic elements from said one or more instrumentation entity instances of said simulation model prior to simulation.