Al,
As I got it from GC when I first brought this question up, the original intent of the 'no attachments' rule was to prevent the use of stabilizers and inbuilt adjustable tuners, etc. on hunters. Since then, people have taken it and run with it until it's been waaaaay too narrowly interpreted.
You can build a rifle with features that you can't add after the fact. (If the fellow with the 1/2" add-on pad on the cheekpiece had built his own stock and made it to those identical dimensions, would he have been outside the rules?)
Similarly, to argue against the use of some surface finish that the shooter feels gives more control is pretty questionable. If he just covered the grip with coarse checkering -- producing the exact same effect -- would that be illegal?
Face it: We have here another poorly written rule; meant to prevent the gross development of 'space-gun' hunters and being interpreted to create never-planned restrictions. I agree with you that we need rules that prevent distortion of the game but I can't back rules that prevent one method of configuring a rifle while permitting the identical configuration and effect when arrived at simply via a different route.
I think most people are happier with the lesser restrictions that we're now seeing and I've relaxed my approach when running tech.
Imas is right (I HATE to have to say that!
): If it defecates through feathers, it's a bird.