The 5.5u like many boomless Nacras uses a forced rotation system. Rotation takes care of itself most of the time; you would force rotation to maximize sail area downwind in a racing situation, and sometimes upwind in very light air. For cruising, I agree...don't mess with it. As for pulling the pin: Do pull it, but carry it on the boat. Some of the most experienced Nacra sailors I know keep it attached to an eyestrap rivetted to the main beam near the mast step.

good luck w/a great boat