I can confirm that installing the Enhanced Google Search apk linked in that thread DOES NOT WORK. You will get lots of Force Close errors, and if you're like me, you'll be lucky if you have enough control of your phone to uninstall it.
I know you were trying to be helpful, and I'm just posting so no one makes the same mistake I made.
Along the same lines, I'd be interested in hearing if there's a current solution for making the Search button long-press do a Google voice search. (Currently, mine does nothing.)