@glideronic - I'll go a step further... This has become such an important feature, that I'm uninstalling Opera and will not use it again until this is added. It is ridiculous that we cannot delete the defaults (such as Google), and make others (such as Neeva) the default.
I have 8 different browsers on 4 different computers (each for a different client or to test security work). There are plenty of competitors that allow me to do this. Now I have 7... When Opera adds this back, I'll start using it again. Product Managers make decisions based on metrics. I recommend others do this as well...