@leushino I think everyone should have the right to choose what search engine to use in its browser, it's not that I have Opera to work that way, it's just they way it should work, holy crap, even GOOGLE Chrome allow us to delete Google from the search engines list, besides I don't want to have plugins to be able to use the search engine I want to use nor I want to make one, two or fifty additional clicks because the developers of a browser decided to take away some liberty from us.
@lem729 I understood what was happening to Disconnect, when you type in your search bar it shows Google logo, but after hitting Enter Disconnect overrides the search and uses your default, but the results page is not the normal results page from DDG, it has been modified. Talking about shortcut, DucDuckGo won't work from the omnibox, the "d" shortcut is useless, selecting by clicking the duck face in the omnibox doesn't work either and trying to select a text and right-clicking to Search With DuckDuckGo for Opera will just frustrate anyone. By the way someone tell in this post Opera Team blocked default search engines in the name of security, to avoid default search engine to be hijacked, if it's the case we're seeing a babysitter who take away a dangerous object so you won't harm yourself because of your ignorance.
Thanks to everyone, I really appreciate the feedback, I'm leaving this post and right after that I will uninstall both versions of Opera, I don't need them anymore and they are not enough good for me to use them, and @leushino, I'm not "storming off to find something else", at this historical moment we have too many options to stick with a lesser one, it's sad because I liked so much the Opera concept I have made an effort to use it, I already have installed and tried to use Opera as my main Browser at least 8 times, but I always ended disappointed.
Good bye and good luck to every one.