C-z does nothing, C-e works.
I am on the most recent melpa package: 20121227.2226
Are you sure? C-z should display the first line of docstring in mode-line.
I can't reproduce here.
I am probably confused.
It used to show the help buffer in anything; helm-info-at-point is also showing the full doc on C-z. I think it would be more consistent (and arguably more useful) if helm-c-apropos would show the full doc.
Ok I don't use much this feature myself also, and it is even simpler and easy to maintain for me, I will remove it.
This feature is also available in lisp completion, and there yes it is useful.
I suppose I bring that to helm apropos after implementing it for lisp completion,(don't remember) but that was a bad idea.
* helm-elisp.el: Issue #181 Remove show info in mode line in apropos.
Oh, you are lightning fast. Thanks a bunch.
BTW, what is the lisp completion feature you are talking about?