Marcus you bring up a very interesting topic.
I am in New Zealand at the moment,and went to a bar watching a guy play. He has quite long bridge for most of the shots and played fairly good. I asked him why does he use a long bridge. His reply was, he found for himself, that if he bridges at the pivot point ,he makes more shots than if he bridges at a point shorter than the pivot point. He has 3 cues, 1 he uses on the full size or 12 ft tables that has about a 10 inch pivot point,the others have shorter pivot points,the one he used when I saw him was at about 9 inches which he uses for bar tournaments.The last que was the 1st cue he ever bought and did not know what to look for in a cue. He said it was terrible and has about a 7 inch pivot point.
He has what best looks like a thumb nail ring on the shaft at the pivot point.
I asked him where did he learn about pivot points and he said a guy from a tournament in Las Vegas told him about it.
I have been trying this myself, and I think there is an advantage in knowing the pivot point of your shaft.
Neil Lickfold