Good thread subject!!!
I would guess that a captain's decision would (and could) be based on past experience. I've let a handful of others ride my old Yamaha XS1100E. I let a fellow worker/biker ride it. He blasted down the street toward the main 4 lane highway down the busy part of town. It accelerated so quick (for a bike built in 1978) he could not get her shut down & "slid" clean across 4 lanes of potential traffic & down into a shallow drainage ditch. He returned to the shop kinda sheepish looking & told me the story (I did not see it happen). Before it was 2 years old, my brother nailed a parked car with it. Out of commission for about 2 years (I was a kid with not much income). Bent forks, goose neck, broken front mag. Luckily no deformed sheetmetal. And, during the 2 years it sat in the basement, I did not notice that the mice were eating the insulation off the wiring. Yea, what fun that was. It took a port-a-power, a come-along, chains & a right stiff bar to straighten the frame (goose neck) out. When we finished and put it back together, we were only 1/4" off (short) on the wheel base.
Then, I watched another friend throttle to a speed that he "apparently" was not comfortable with, cause when he came to a curve in the road, he nailed the curb. The front suspension took it well but when the rear tire contacted the curb, the bike was airborne (as well as the rider). Bent handle bars, broken levers & mirrors, etc. Buddy was banged up but "walked away".
I have let other friends ride it since all the caos in the early years (yes, it's still road worthy) and have not had to cringe. Guess my choices of fellow riders got better. During the 28 years I've owned the XS, I've only riden one friends bike, it was a Sportster, about 1983. Then the Rocket came into my life just last year.

"How sweet it is" (Jackie Gleson).
I'd think really hard (and then talk myself out of it) if I "ever" allowed someone to straddle this monster. I'm thinking I'll keep ALL THIS FUN to myself, and let them experience the jealousy as I "ride off into the sunset". Who said that guys?
See ya.
OH, I forgot, Vonbonds did let me take his Rocket for a short spin during the Sedalia gathering. Now that's "TRUST". Thanks VB!