Rocker Arm help
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I can't say I disagree with what you have said. Once you get into complex 3D machining, there is a lot of cool stuff you can do. Inverse feed rates, if I'm remembering the terminology correctly, makes my head want to explode. But, it's obvious that is not what is being used for machining the Speedmaster heads. With the inconsistency of the stand machining, I wouldn't be a bit surprised if they are being slammed on a fixture in a manual mill and stepped over by hand.
I've rarely programmed manually, unless the CAD/CAM software didn't want to play nice. My boss at that time was a major cheapskate and wouldn't buy the latest, or full versions of the software, so you had to muddle through the limitations.
I understand the idea of being able to comp for tool diameter. I've had to do it many times. And, I'm also familiar with doing Nurb Splines for the purpose of creating customized contours and shapes For example, needing to seamlessly transition from one radius to another in the same arc. It's been a while since I've done this stuff, so my memory of functions may be faulty, and I could be thinking of something else.
My correction kits are done on manual machines. I couldn't justify a CNC for making one off customized parts. If I was running 100 orders at the same time, I could use the machine offsets to quickly change to another order requirements. But, I build engines, do components machining, sling parts, and then make the kits as a unique service to Mopar enthusiasts. It isn't a full time manufacturing endeavor.