I'mnot sure what QUIRK really means, but having it for the sake of having it doesnot seem to make sense.
If the PIMPLE added to the overall quality of the hole or the course they could figure out a way to maintain it, I just don't see how it could add. The 18th green is, admitedly, less dramatic than most of the others, but for some reason it works pretty well on that hole. Keep in mind Pat that the approach to the 18th is every bit as severe as that of the second prior to the green surface. The green surface irself is far from flat, with about 6 feet of elevation change from the front right to the back left and a significant front to back slope for the first 12 - 15 yards of the green.
You are correct that a large percentage of shots onto the green gather in a general area in the center to right center, but when the hole is not there, your putt is not uneventful...
I am not suggesting the a ridge or spine would not add value, but I like the current green as it is more than I like the idea of speculatively creating a feature the original designer wrote about maybe adding.