Adding the safe shot mod to WoT wouldn't prevent arty from teamkilling on purpose. Safe shot works based on where your crosshair is, so you could place it right next to someone.
(By crosshair I mean the fixed crosshair, regardless of where your gun is pointing... so if you have autoaim on someone, and there's a friendly in between, and your crosshair isn't on the friendly, you'll still hit him)