If they were added in, they would have to have some kind of trade off. Like being able to have rending claws, but not being able to use ranged weapons, being really quick, but shedding body mass so you're less durable. etc. Or As cosmetic changes for each God. (Nurgle makes your character look bloated and grotesque, Khorne makes you spikey) That would be pretty cool. Just some two-three dollar cosmetic item that would make your character look awesome, but not have any real effect on gameplay. Either one works and is badass in my book.