Right now, if I select something and do a right click, the only search option I see is
Search Google for 'whatever I selected'
How do I add more search engines to this list?
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You can't add additional search engines, but you can change which search engine it uses. Setting the default search to Yahoo would then allow you to search Yahoo for the selected text. I think being able to add additional search engines to this list would be a great idea though, so I have added it as a feature request.
The only alternatives would be to use a bookmarklet like the one created for Wikipedia or to use a Google Chrome Extension, however both of these options would require clicking on a link or button instead of right clicking on the text.
I am using this extension: https://chrome.google.com/extensions/detail/ocpcmghnefmdhljkoiapafejjohldoga
I also had this issue and didn't like any of the extensions I found so I built one :D Please, do try it out and let me know what you think of it.