It is impossible (or unclear, how exactly) to use the swiper from within itself.

[pavlo-alkhimov]

The initial problem is the keybindings of the swiper.
I want to make the shortcuts completely same to isearch so that I use my muscle memory without learning any new key combinations for same functionality. You know, like pressing C-s repeatedly would go to the next found and C-r would go to the previous one and so on.
Now, the problem is that if I use isearch and during the search I call help for some reason (say, I pressed C-h b and check the current key maps), I can use the isearch again inside that help buffer. This feature is extremely important. In fact, I only use help with support of isearch. With swiper I cannot do it though. If I try, it falls back to the initial search. Can anything be done to fix this in the sense that I have another swiper for help and then could return to the initial one without losing the search string?

(And related question: is it possible to limit the minibuffer so that it pops up not in complete window but inside the related buffer only? But this question is minor.)

[abo-abo]

Thanks, it should now be possible to swiper another buffer. Just set (setq enable-recursive-minibuffers t).

(And related question: is it possible to limit the minibuffer so that it pops up not in complete window but inside the related buffer only? But this question is minor.

It's impossible. An Emacs limitation.

[pavlo-alkhimov]

When will it go to ELPA? (I use the standard facilities and do not pull from the github directly)

[abo-abo]

MELPA builds every 4 hours. A 0.7.0 release is coming to GNU ELPA this week (new release every few months).