See if it's possible to make shortmarks the default search engine for Opera. Try as I might, I can't do it. I don't think it's possible.
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Anonymous
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I wish I could, but you’re right, Opera doesn’t allow it.
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Adminjaden (Owner, Shortmarks) commented
I have tried but the most recent version of Opera (49.0.2725.39) provides no way to make custom search engines the default search engine. They are actively antagonistic to all but the few default search engines included.
It's a real shame because Opera used to be known for being easy to customize. You may consider using Vivaldi, created by the former creators of Opera. It still adheres to the original principles of being easy to customize.