Typeaheadfind Missing panel in Mozilla 1.2.1

I can't seem to find the panel in edit->prefs->Advanced for
typeaheadfind described on the following page:
http://www.mozilla.org/projects/ui/accessibility/typeaheadfind.html. 
It says quote:

Settings

    There is a new Keyboard Navigation preferences panel, under
Preferences - Advanced. It contains a few Find As You Type
Preferences, such as startup options, and whether the timeout or sound
should be enabled.


However, I do not see that panel.  I also tried to modify the
user.prefs file to change typeaheadfind params, but nothing changes. 
Typeaheadfind does work, but I cannot disable the automatic timeout.

Any ideas?  Cool feature BTW. :-)

-Edwin