I put a challenge to get to subsonic on every track OR 100,000 points on every track.

Of course the score is more important than the zone. You have perfect zones (1,000) perfect laps (2,000) BRs (1,000 or 1,200 I'm not sure - you'd think I'd know) and 100 points for every speed pad. On some courses there are 16 pads per lap so the points stack up quite quickly. For most courses I have targets to be at points wise at certain zones.

You could easily go round avoiding every speed pad, making the odd mistake and getting to a further zone but thats why score is more important (IMO) than Zone.