[scalableUnicon]

If you're using DuckDuckGo, we can use the !w bang to search directly on Wikipedia. Bangs are really handy, when you know where you'll find the answers, and can fallback to !s (startpage) if you feel google will have better answers for current query. This feature has been very useful for me, especially !mdn, !cpp etc. when coding.

[doublesCs]

I think the correct place to have this is on the browser, not on the search engine. I also have a cpp keyword on Firefox :-) They're getting the same result, except mine is faster and more private.