A. If you don't plan on carrying stuff on the rack; I would advise against it.
Unnecessary cost and weight. I'm ok rolling my S6L on it's stock plastic wheels.
And I roll my bike a lot! Concrete floors and sidewalks, tile, etc.

B. I use battery powered lights; so can't make a recommendation for a dyno.
I went for a ride with another BF member on his dyno equipped hybrid. We
were side by side on a dark bike path when he turned on his light. At 1st I
was impressed by the beam and it's spread. That is until I turned on my cheap
(US$20) helmet mounted flashlight; has a stronger beam and would even out
power his lumens.

https://www.youtube.com/watch?v=RFxC...6zPoymgKaIoDLA

C. My 1st Brompton had the raw finish and I really liked how it looked. I sold that
to get a Ti model with lowered gearing. I decided to get the racing green color. I
regretted that choice. If I ever get another B'ton; it will have the raw finish.

https://www.youtube.com/watch?v=kt5M...6zPoymgKaIoDLA