Two thoughts:
1) I assume pole position is the inside lane. For some cars that do line following, it's actually better to be on the outside lane, so when you "look ahead" you don't accidentally cut off the corner. Can acceptance of pole position be voluntary?
2) I can see the case for disqualifying collisions now, but eventually I assume that "aggressive tactics" may be part of a winning strategy (see Mario Kart). Open for discussion later?