The Scout Archetype only works if you make a charge. If you aren't charging, you don't get the Sneak Attack. It's not like the 3E Scout class where you get bonus damage for moving 10 feet, the archetype requires a charge, which is a full-round action.
Not true. Once a Scout hits 8th level, they don't need to be charging anymore. Any time they move ten feet and attack, they do sneak attack. That means they can dogleg: move 5 feet, go around an obstacle to the foe and sneak attack; something that isn't possible with charge.
At 8th level, whenever a scout moves more than 10 feet in a round and makes an attack action, the attack deals sneak attack damage as if the target was flat-footed. If the scout makes more than one attack this turn, this ability only applies to the first attack. Foes with uncanny dodge are immune to this ability.
This ability replaces improved uncanny dodge.