So, unless I select it as a browser, it's of no consequence.
Absolutely.
Since you brought it up I have done some checking with third party browsers Chrome, Chromium, Camino, Firefox all offer Google, Yahoo, and Bing as primary search engine options. iCab offers those three and several more euro-centric search engines as well. Lightning offers Google and Bing but not Yahoo. Sunrise does not offer a default browser, instead you have to specifically go to the desired browser's home page. and as far as I can tell Roccat only offers Google. There are other Mac browsers out there of course, but those are the only ones I have to play with.