I just pushed a small update to my Ubiquity for Opera user javascript. Two tiny changes:

• Now the ESC key hides the Ubiquity window
• Fixed the text selection and focus when you reopen the Ubiquity window and you had input a command before.

Thanks to Martin Šrank for contributing the ubiq_focus() fix.

To download the latest version, go to http://github.com/cosimo/ubiquity-opera/. There's also a minified version there.