The opening post baffled me until I read some of the follow-up posts, I have no idea that Americans did not use their knifes and forks in the same way as Europeans - as someone else pointed out - here we'd maybe see that sort of style in a child or maybe someone who had a disability and couldn't use both hands at once.
So do Americans not do the 8 o'clock (fork), 4 o'clock (knife) placement to indicate that you are taking a rest and then 6 o'clock (both) or 4 o'clock (both) to indicate that you are finished?
The thing is, there just aren't these many rules in American dining. Maybe for super fancy rich people there are, but I can't remember ever being taught or anyone actually following any place setting or silverware rules. Just don't talk with your mouth full, that's about the only rule I've ever witnessed being enforced at a dinner table. Otherwise, you eat however is most comfortable to you. Also, at restaurants, waiters and waitresses are often more chatty, so there is no need to "signal" that you are done eating, they've likely come around enough to realize that you are talking and no longer eating.
Anyway, this is a strange discussion to me because, first off, I don't eat foods that require a knife all that often I suppose (maybe once a month), and second because if I do have something like a steak, I cut all of the pieces before I begin eating. I always cut and eat with my right hand, as I would just be too uncoordinated to do it with my left hand, and I would find it annoying to have to stop during the meal to finish cutting up the steak. Just get it all done with at the beginning and then enjoy the meal.