Oh, I didn't try landscape mode ! Thanks for the tip (off to re-install the app now...)
EDIT: it worked. However I find the font spacing/kerning excessive, the blurry text transitions whilst zooming are highly distracting, and the small text size + lack of adaptive layout rendering (column width auto resizing) means that I am promptly uninstalling Opera now (on the plus side, it loads pages pretty quick...albeit without any Flash capabilities as far as I can tell). Dolphin HD and xScope remains my favorite web browsers, by a long way.