About JMeter GUI - In the Add menu of components, In Sampler sub menu JSR223 Sampler is not in top ten, even after Beanshell Sampler.
Other JSR223 components are in the top 5 at least, I suggest JSR223 Sampler will be higher on the list (4th?) http://jmeter.apache.org/usermanual/best-practices.html#jsr223 Thank you