Well, my plan would be to take the erasers off a bunch of pencils and stick them on the points of the cat's claws. I figure that should be sufficient.
Seriously though, I have not read much about the Savannah (as I am at work and have to get shit done), but it's definitely a neat idea and I imagine that they've taken steps to ensure that the claws don't become like those of a lion or panther or any one of the "big cats". After all, the Savannah isn't <b>that</b> big - 25 pounds is a lot for a cat, but think of a dog or something. Not that much.