Opera mouse gestures are pretty much the only reason I use opera, specifically the right click + scroll. I won't update until this is added with the same functionality as it has in Opera 12, it's extremely useful for switching between tabs when you have so many open that you can't read the title at the top.
Opera seems to have been taking steps backwards with the new browsers making them less customizable and basically dumbing down everything to make them more mainstream. Opera used to fill a niche for users who wanted deep sets of options and features with a speedy robust browser but they've abandoned that it seems to go after your everyday IE user and that's alright if a bit disappointing, but the mouse gestures are the one thing I can't do without.