This followSplineTrack() call boils down to a command on a native object of type sl:0x0000006Er which refers to the native bot class defined in the exe, this is the source of the crash; the game processing the "AI_spline" command on a bot so until someone finds out what are the special circumstances that make the game crash I think the best is to avoid issuing more than the absolute minimum of AI_spline commands to the engine.
On the other hand if and when this gets fixed your idea is totally sound and would be interesting to see the randomised routes the cars take on a track sometimes using a shortcut othertimes not sometimes messing up a curve and the like, would surely make the races more lifelike.
