Rookie MTB questions!

Could someone tell me what this blue dial on my rear shock does?

I understand it’s attached by cable to my remote compression damper thing (open, threshold, and lockout, accessible by handlebar all pictured).

But the blue dial itself can be pulled outwards and rotated to -, o, or + positions. What does the + & - mean? (pictured in + position below)

Separately:

Is it safe to assume that adding/removing rear shock tokens affects ramp rate similarly qualitatively to the token additions/removal in the fork?

Is it harder to do because it requires taking the shock off??

Finally…

Is my understanding below correct, generally for my two scenarios?

Me: 220 pound rider+gear, bashes rocks on XC bike, generally rides like a cocky 18-year-old.
More tokens, slightly softer sag, open compression, fast-ish rebound = good small bump sensitivity, but less likely to bottom out if I rip a descent and then hit a big compression unexpectedly because I’m riding like an idiot?

My wife: 145-pound rider+gear, no bashing, rides gently, fear is an issue on gnarly stuff:
Remove tokens if she’s never anywhere near maxing out and already running pretty soft sag (25-30%) with open compression?