I've set OpenSearch engine to Whiskypedia, but location bar searches (with up arrow) are still made with Google.
I'm sure many people won't like this "inconsistency", but it's the way you can use 2 engines at the same time, without changing anything.
I hate search box in Ff, pushing you to change engine whenever you need it. Always present, stealing space. And i love SM location bar, which allows to search without any search box.
Never change this behaviour, please. It's GREAT!
And thanks for your work.