I think this is not a great idea, stealth and security are two completely different things.
While of course security as it was in oblivion will not be a little bit to small as skill to fit in skyrim, especially since Beth is removing skills and giving each remaining/new skill more content (is that the right word?).
I would love to have security not only unlocking doors as in oblivion, but also locking them, disarming traps (possibly a little minigame different for each trap) and making your own.
What do you think?
(I do hope there us not another thread about this, at least I haven't seen one...)