Like the OP said - we need a Hit detection system - and i think corner cut 3 times (warning based on the number of laps) and - dnf’s issued :0 credits- 0 XP if not associated with a hit prior to the corner. With a hit detection system- wall riders the same - Warning three times and then DNF and ghost,
There is already some kind of hit detection system and it further determines severity - as these are stats on the drivatar page - so possibly use this determine if shunted - and further more use it for wreckers as well - ghost and DNF-
Or make a Hardcore Lobby(s) so those of us that like to race (without cutting/ wall riding and wreckers can have the “strict” set of rules - but penalties should be assessed by warning (number) depends on lap count of the race(?) and finally ghosting the car and zero credits and zero xp . A certain number of times the dnf (Black flag) ruling is imposed, say 3 - you’re kicked from HardCore Lobby for 24 hours and back to back kickings result in restricted access to the hardcore lobby(s) - for 30 days.
Or just make user created public lobbies where the user that sets up the lobby has the ability to enforce whatever racing standards they would like to impose.