I think that 1 or 3 may be true, but I don't think 2 would be. Why? Because it's too boring! It makes a lerasium spike irrelevant, since you could just burn a tiny bead of lerasium to get mistborn powers.
Plus, isn't Atium able to steal any of the powers?
Very excellent point, Zas. If that's what lerasium did, it's too boring. And you're right, atium can steal any power, given the right placement.
Brandon did say Hemalurgy had greater implications than just Scadrial, so I'd imagine with the right placement, you could steal Breath. That sounds like an easier thing to do with atium than lerasium, though.
You mean what lerasium did Feruchemically?