2.8 Can't find "Create orientation" in the menus, therefore can't add it to "Add to quick favorites" does not work in Search Search says "create orientation" is in Transform menu, but it's not there.
Where is it ?  

I did map my own key combination for it, but still.
The one from 2.79 ,   Ctrl+Alt+Space

Would be much easier if anything could be added to quick favourites directly from Search, to streamline the processes even more.    

 "Add to quick favorites" does not work in Search
Is it what you're looking for? You can right click to create a shortcut: