Can't create keychain on vg7_scorpion_scorcher because the 'KeyChain' slot is missing. Add the following config.cpp to your serverpack to enable keychain creation (the keychain provides additional useful info like vehicle ID):

class CfgPatches
{
class vg7_scorpion_scorcher_KeyChain
{
requiredVersion = 0.1;
requiredAddons[] =
{
"DayZExpansion_Vehicles_Data",
"NAME_OF_ADDON_CONTAINING_vg7_scorpion_scorcher"
};
};
};
class CfgVehicles
{
class vg7_scorpion;
class vg7_scorpion_scorcher: vg7_scorpion
{
attachments[] += {"KeyChain"};
};
};

Would it be possible to make it optional?
So if there could be a .json with an option to set ON/OFF?