I think there’s a mix of issues about noise and safety.
While the OP states noise is a complaint issue in some circumstances, it seems not to be the main issue for scooter use on the driveway?
If the existing by-law was:
7 Children playing on common property in building
An owner or occupier of a lot must not permit any child of whom the owner or occupier has control to play on common property within the building or, unless accompanied by an adult exercising effective control, to be or to remain on common property comprising a laundry, car parking area or other area of possible danger or hazard to children.
Or
8 Children playing on common property
(1) Any child for whom an owner or occupier of a lot is responsible may play on any area of the common property that is designated by the owners corporation for that purpose but may only use an area designated for swimming while under adult supervision.
(2) An owner or occupier of a lot must not permit any child for whom the owner or occupier is responsible, unless accompanied by an adult exercising effective control, to be or remain on common property that is a laundry, car parking area or other area of possible danger or hazard to children.
Would either of those (the old and the new model by-laws for NSW) actually allow for a child to play on a scooter on a common property driveway?