I got it as a search engine, but making it a WEB search engine seems impossible. Google only lets you pick from Google/Bing/Yahoo which is actually Google/Bing. And thats in the internet settings.
I'm telling you, Android is customizeable, but in such a way that 99.9% of the people won't figure this stuff out. And the 0.1% who do won't get anywhere with it anyways.
If you get firefox, then u can customize it.