There was never a "four-speed thing". It was a misinterpretation of the system.
Vibrations.
The one and only supercharger arrangement used for the engine.
Not a clue. Just trying to be clever, I guess.
Not a clue. But I suspect a lack of experience, knowledge or resources.
7.
Normal was to use a quill shaft. Removes some of the torsional vibrations from the engine, and protects the reduction gear.
Don't know why Forsyth chose to put them directly on the crankshaft.
Not a clue.
You'd have to ask Captain Forsyth.