Re: isearch-yank-char

[Richard Stallman]

    But most importantly, C-f is the most backward compatible key binding,
    because when the user types C-f without leaving isearch mode with the
    intention to move the point right, nothing bad happens: the user
    simply types RET or any other non-isearch key to finish isearch, and
    the point remains exactly at the same position where the user wanted
    to move it!

That is an idea worth thinking about.  We could try it.  However, it
could confuse people who are accustomed to assume that after typing
C-f they are out of the search.