Very useful, indeed.

One thing that I am missing already is searching inside the history for a specific input. There is some search facility (in vi mode, you can press / and it says that it will search), but I don't know how it works, since it gives no results.

Ok, now I see, it just marks the search results, but does not give an immediate result. That is not, what I would expect and what would be useful for me. In ksh, I believe, there was the possibility to search backwards in history and when it was performed, the most recent input line was put into the active input for replay or editing.