Champion number

OK, a small bug, but still a bug. My driver Nieto won last season's driver championship, yet he is running with number 7 on his car, only because his team finished in 3rd in the constructor's standings. To my understanding, number 1 is reserved for the drivers' champion, regardless of his team.

Nope number 1 is currently reserved for Constructor's standings regardless. Considering that the driver championship is completely trivial cause there is no diversity when it  comes to drivers and little reward to the driver's championship.

You mean in iGP ? Because in real Formula 1, number 1 is reserved to the driver who won the drivers' title the previous season. Look at 1993 and 1994, there was no number 1, because the drivers that won in 1992 and 1993 didn't compete.

Alin, David means in iGP. Number 1 & 2 are reserved for the winning team here.

If you open the livery editor again and save again, it'll refresh your sponsors and car number on the car.