so, on course alteration..... you get disqualified for intentionally doing it. ie "throwing and object at your crawler to get it working again" you get dq for that. but ive not seen a single person.. get a dq for intentionally moving a few rocks with their steering on their rig.
put them back but make sure its with your steering ;-)
And if someones moving rocks for an advantage with their steering, I want that servo!