OK. I take it back. It is possible, though difficult, to achieve using normal settings.
You can see from the screenshots posted how close to the edge you must be to achieve the jump @ 150 fps (approx.).
I tried a few various settings and it's possible using many of them.
I have attached 2 screenshots with highly zoomed-in radar to demonstrate.
The first shows the position where I jumped:
- Launch.jpg
- Location at jump time
- (94.76 KiB) Not downloaded yet
and the second how I landed:
- Landing.jpg
- How I landed
- (54.07 KiB) Not downloaded yet
It was necessary to turn slightly in mid-air in order to catch the ledge.