I ask you to add the to plugin
car.OwnerID = player.userID;
car.Spawn();
Having a chassis owned by the player who made that chassis will give the plugin more options to implement.
Thank you so much.

I can add a config option for this.

Can you tell me what this is enabling? What other plugins will use this and how will they behave differently when the OwnerID is set?

There are plugins that use the Steam ID of the entity, you can put a combination lock, make the cars disintegrate according to the Steam ID to prevent theft, you can pickup the cars using the "Orange" Portable Vehicles plugin.

Added in v1.1.0. You can now set SetOwner to true in the config.