Infinite scroll and more...

Hi!
My english is too bad (im spanish). i try to explain the most likely.
I am thinking of convert my portal with infinite scroll, but...
I have seen in other portals that, when you enter into a post, below the disqus comments, continue loading (in infinite scroll too) the other index posts from this point, no need to go back to the index.
it would be interesting to consider that option, and a button in the menu bar to activate/deactivade the user the infinite scroll option.

I don't know if I have explained myself.

Thanks.