Any way to make Opera the default browser on the iPad?
Apple doesn't let you, because that's what they call "premium experience". :jester:
At the moment it's not possible to change default browser, however if you have iOS 8, you can easily open pages in Opera Mini, by using Share from other apps (including Safari). There should be Open in Opera Mini action which will open current site in Opera Mini. You may need to click "More", to enable this action.