Very nice, Carlos, thanks for the pics.
I can see how both the "thumb on spine" and "index finger on spine" grips that you have shown would be improved by the notch. I've tried those grips on my large plain edge Rescue, and they are good for detail work.
I'm not sure that I understand the scissoring though. I guess maybe for one squeeze to cut through a line or cord it would work, but I can't see it being very useful on fabric or anything flat. The spring is so strong that you wouldn't get much scissoring action, and the handle is not going to hold the material in position to cut.