When typing in websites that I've been to already, Opera will automatically fill in the longest URL for it, having to backspace through all that wastes a lot of time.

The ability to autocomplete top level domains based on modifier keys (ctrl/shift/ctrl+shift) like Firefox does would be awesome, as well. For example, type in "opera" and then ctrl-enter, and it fills http://www.opera.com for you (Opera already does this, it looks like). Shift-enter for .net and ctrl-shift-enter for .org. Or user-customizable shortcuts for this.

Would appreciate it! Great browser otherwise, of course.