I doubt that'd do much good, especially in the newbie section.
We have a search feature on this forum already, and the people who are forum-friendly will be using that feature before starting a new topic. The people who like to start new topics for everything will continue to not search, and it's not like the search feature is hidden any they're missing it. If this was implemented, I bet most will ignore the search results, say it's new, and post away. Reddit somewhat has this feature, and the same stuff gets posted a million times over and over.