Thomas,
This doesn't answer your question exactly, but I have to say that, especially in benign weather, I don't enjoy watching the Open at St. Andrews as much as at some other venues (e.g., Muirfield, RSG, even Lytham) because there are so many short par 4s, the trouble doesn't seem to come into play very often, and one's iron play isn't tested to the degree it is elsewhere. I prefer watching the Dunhill event played at St. Andrews in the fall when it tends to be cold and the course plays more difficultly.