Transgo TF-2 question

I've installed the TF-2 kits before but never did the shift command feature but according to the instructions you can do it on a bench grinder but just be real careful and get it to size. I personally don't see the big deal with this option in a street driven car myself that's why I never do it. If your governor is set up properly and throttle pressure linkage is adjusted properly it will downshift at any speed you need anyway. Why would you need to downshift at 6,000 rpm anyway. Just to blow your engine???