Is it possible to voluntarily decide to move all the sails (from backing sails to no sails at all => struck sails), even if no damage sails counter is taken ?
Or does the struck sails rule leading to a full stop is only applied when a struck sails damage counter is taken ?

If not, does the ship still have to follow the "struck sails" rules, or can he continue to program maneuvering cards as normal, knowing that the ship will only move when its sails change from "no sails" to "backing sails" ?