Indeed, when you get very far outside of keyboard instruments, there is no "temperament," but merely a scale that's good enough for most purposes, evolved over time. And a better instrument might have a better scale. Players "lip" the notes up and down. Brass instruments have little tuning slides -- it's fascinating to watch a master play the tuba. Whether or not you activate these devices depends on how fast the passage is, and whether anybody is likely to notice.