There's a quick searches (or something) bookmarks folder that lets you define other behavior. You can check what's in there for examples on how to use it. I have:
google <search> : searches google
img <search> : searches google images
imdb <search>
I prefer to hit Control-L and type what I want than hit Control K, control up and down, etc. to find the search, so I have a lot set up like that.