As far as i can remember the pendant powering the peace keepers is bound to the duke. And as long as the duke isn't near Rose it either does not charge up at all or only to a small part.Especially with Rose it makes sense. It feels pretty organic that she needs to do more and more depraved stuff and group stuff is a pretty natural evolution of that.
Her story is linked to the duke and for things to change the duke would either have to agree to let others corrupt her or Rose would find an alternative to the dukes pendant.
Of course this is ultimately a porn game, if enough people want the story to change in a specific way then it will be changed regardless of the plot. I have my doubts about how many supporters are really keen into such a change, however. Most times it's a minority trying to seem more than they actually are, making it up with a lot of noise and persistance.