I've seen just about every green speed, and I've seen courses vary by 1 FT max putter distance. I have a course where the putt speed is 127 feet, another with 125 feet, and one with 122 feet. I've seen both 144 and 145. I've seen 187 and 183. I've seen 101 and 103. I'm pretty sure anything from 101 through 187 is possible.
I also note that when I am zoomed way in so that I can only see a single texture (such as fairway), my frame rate improves, and I can make the minute adjustments to the sliders. When I am zoomed out and press the A/D key, the dial jumps a lot.
As for the green and fairway firmness settings, anything below 10:30 is interpreted as SOFT, anything above 1:30 is FIRM, and anything in between is MEDIUM. I really hope a future update allows designers to dial these settings in precisely, giving us greater flexibility. FIRM fairways are just ridiculous near the greens.