>>> 1) Are there any option to move the cursor to the start of the 
>>> candidate after the search? I see that there is an isearch-other-end. 
>>> But it is not a custom but an internal variable. Now I am using a hook 
>>> but it seems a bit hacky.
>> 
>> As you see from the discussion, adding a defcustom makes little sense, 
>> because this feature might be needed only occasionally, so better to be 
>> bound to a special key, e.g. C-RET to exit and move to other-end, S-RET 
>> to exit and mark the found string as a region.
>
> Note that neither C-RET nor S-RET are available in a terminal.
>
> What I consider to be the most useful feature of CTRLF, namely the 
> possibility to scroll among the matches, has not much been discussed so 
> far, alas.  I attach a short patch which implements that feature in 
> isearch.  I've been using it for a day, and I'm convinced it's a 
> must-have, it makes navigating among the search matches much faster. 
> WDYT?
>

Sorry, there was a typo in the previous patch, I attach a corrected one.