I'm not sure what files you would alter, but if you "mod" a setting in the game for the AI control of the rudder, you might possibly also limit the rudder for the user, and could potentially lose the evasive moves. If you want your "autopilot" to do like you're describing, you could draw the routing in the way you want, so that instead of one point for a 90 degree turn, you now might use a dozen, with "transitions" into and out of the course change... ??
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