Since this Hardcore Ricochet (i.e. Friendly fire is enabled but the damage done to teammates is inflicted towards the firing player with no damage done to the teammate shot at) is implemented in COD Ghost for the wiiu, the problem of team killing trolls is finally over.
However I recently found out that Ricochet is not enabled for the dog (kill streak reward) when I ran into a not so nice "team"mate that killed my sweet dog on purpose. I later tested it with a clan member and confirmed that friendly dogs can be team killed.
@DEVS: Could ricochet be turned on also for dogs?