I used to race a sailboat with adjustable rake. But it was a single-tined "mast" not a twin-tined "fork".

Suppose you had adjustable rake on your bike. Wouldn't be C & V but you could dial in the trail and fall asleep riding no-hands or go to criterium-quick handling.

Edit: (and on topic) I never saw the raking devices of either Peter Mooney or TiCycles. I'll have to ask at TiCycles next time I am there. Peter built me two forks. (I crashed the first and didn't really like the too stiff characteristcs; better for the touring I did little of.) Second go-'round, I had him make the forks from lower in the taper. Also started the bend considerably higher. He had recently (1984) acquired a device to do more complex bends. To this day I love that second fork; both how it looks and how it rides.

Ben