Nice closeups. Here is the shot from a slightly tougher position:
http://www.youtube.com/watch?v=Te-iCc-2NxQ As a proposition shot, do not give out more than 10 tries for this one.
There are two other versions of the shot as a proposition. In one, the cue ball starts up on the name plate (or rail, if there is no name plate there).
The second is like in the video linked above but with the object ball a diamond tougher along the cushion. The story -- at least as reputable as most pool stories -- is that a road player would bet on it but only large amounts and would ask for half an hour to make it or some such. And he would bet on nothing else.
As for ball-first, we know it's possible to do 93-degree cuts with extreme outside. It's also possible to swerve the cue ball and come in, but if you hit ball-first with inside english, it is unlikely the ball will go into the pocket unless you also hit it a second time after going into the cushion.
I suppose I should look at the rest of the conversation in onepocket.org, but it looks like someone is very confused.
As for knowing about the shot, I think the cat was out of the bag a long time ago. This is from a book that was printed in 1978 and has sold more than 300,000 copies:
And here it is in a book that was printed in 1908 but did not have as wide a circulation:
