address bar search dropdown

I'm using Opera 11 and the single letter address bar search function (i.e.
"g something" to search for something using Google).

All of the search key-letters bring up the address bar dropdown list
with my previous search terms but some of them also add a list of possible
completions that are unrelated to my previous searches.  For example, if I
start typing a "g u" I get my previous Google searches that start with 'u'
and I also get the following list:
  usps
  ups
  utube
  usc
  ucla

Is it possible to disable this feature and only show my actual previous
searches in the dropdown?  Of the searches I've tried only g-Google and
w-Wikipedia seem to add the extra list of possible completions.
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