Recent sample libraries are using keyswitches variedly. For example, Ilya Efimov's LP guitar library uses the velocity of Keyswitches. It reads lower velocity as "OFF" and higher velocity as "ON". And also it uses HOLD keyswitch which is not an one-shot keyswitch but a long-duration keyswitch. Another library needs multiple keyswitches at the same position. I hope to see keyswitch functions expanded in Overture 5.
Reference
[url]http://www.ilyaefimov.com/Documentation/Ilya_Efimov_LP_Electric_Guitar_Manual.pdf[/url]
