I don't trust Google anymore and Bing and Yahoo search engines are terrible, I use two anonymous search engines DuckDuckGo and StartPage (Proxy Google) and I'd like to be able to search with them from omnibox by default, I hope you can add this option in the future, you can even add an otion to disable default search engines protection with a big warning in red and capital letters saying "USE IT AT YOUR OWN RISK, I DARE YOU", but the option is needed, what I don't need is a Babysitter protecting me from hijacked search engines.