My main problem with the chains is that it was not shown except from inside of her, then when she was on the verge of death she used it against the kyuubi. Then later on she used it inside of naruto. Lastly it was shown by tobi to tame the 5 tail beast. Which points me more towards it only affects tail beasts and not ninja.
Sure she has sealing jutsu, but how far could that go when the knownledge of the power of that is limited, sure there is the jinnchuriki seals, DDCS, danzo's seal and so forth. But my point is we have a limited view on the full power of it, we don't know how effective it is in battle or how it could be used.
Like I said, her overall abilities are a mystery, she has unique and powerful chakra, a strong life force, and is most likely a master of sealing jutsu. But that is all we know, we don't know if she can use any ninjutsu besides the basic(which I could consider she could maybe even rasengan), or else elemental jutsu. This is one thing kishi is good for, showing us one thing and making us ask dozens of questions that don't get answered easily.
