Many of you who uses Opera may have found this nifty behaviour of E
before, it's quite pratical. E will force the remembered settings of a
window. So, if you start Opera, place and size it somewhere you like with
the border you like, then apply these settings to "remember" and then put
Opera in full-screen mode (CTRL-F11) you will indeed get a full-screen
mode Opera, without ad banner... in a window.