1. There is an Australian Standard, AS 2890.1-2004 Parking Facilities Off-Street Car Parking, that … includes required maneuvering areas. It’s unlikely an OC would be able to propose any changes unless that standard is maintained.
Sounds like a compelling argument for asking the OC to mark the area as “no parking” rather than handing it to your neighbour as a freebie (because that’s what all the BS about visitor and extra resident parking probably really means).