Umm, if roasted, why would they need sanitizing? One would think that happened while being roasted.Yup, they are. Never have done the soak thing. Maybe just been lucky, but haven't had an issue with it
I just dropped 'em in my Oatmeal Stout like dry-hopping. Turned out pretty yummy. Better than using them as adjunct in the boil, anyway. Lost a lot of the chocolate aroma from the cacao, and was a bit dependent on the Crystal 60 for the coffee aroma/taste. Cacao nibs in the secondary/dry hop, though, REALLY made that tasty.
Speakin' of which, about time to put a couple batches of the stout on to let it age for the winter. I get a bit lazy with my brewing once I have something drinkable on the shelf.