Hello everyone. If you reallyreally need an megamenu function for your website using the corona theme I can tell you: today is your lucky day.
1) Get the Ubermenu 2.0 plugin for 16$ from theme forest: Ubermenu.
2) Adjust the custom CSS as explained in the plugin documentation to move the menu to show on the right side of the logo: http://wpmegamenu.com/help/#FAQ-wider-submenu
I have not yet adjusted the CSS to get the original "corona-look" working. I have also not tested for browser compatibility.
Hope that helps.