I try to use the engine torque, it is nothing to take a corner in town and just drop from 5th to 4th, no strain.
Shifting without a clutch is a no-no in my book. The transmission is a motorcycle is nothing like a Roadranger. there is only one neutral and the transmission passes through neutral only once in progression. Otherwise it is always in a gear.This makes it impossible to "float" a shift. Yes you can get it to shift without the clutch, but there can be nothing smooth about the shift. This rattles the whole drivetrain and causes stress throughout the rear axle.
I know I probably opened a can of worms, and everybody has a different opinion and 50% of people will disagree. But the clutch was put there for a reason. Do it however you wish.
I have overhauled transmissions, Automatic, manual, car, truck, motorcycle, front end loader, If it has gears I have worked on one.
I admit the the book sounds crazy, the goldwing has incredible torque and power throughout a wide rpm range. Your best bet is to get out of the lower gears as soon as possible and use 3,4,5 to get up to speed. In trucking they call it progressive shifting. Or you can shift it like you are mad at it(aggressive shifting).