>make Thread Group more flexible (to simulate open and closed system without plugins)
This >I understand it may break old test plans (jmx files) The new group can be implemented in a completely new class file, and the current test group could be deprecated (e.g. renamed to "old thread group" in the UI). Then old test plans would work just fine, and there might even be a quick-fix to automatically replace old group with a new one Vladimir
