Opera Mini 5 Beta 2 as the default browser...

[dishe]

That's because Opera mini is not a native app, and running inside a virtual machine.
Ever wonder why you can't copy/paste on mini?

Java is a virtual machine... that is, it runs independently of the rest of your WM system. Opera Mini is not even aware that your phone is running Windows. It would be the same on any Java enabled phone.

I recall someone found a workaround to make Opera Mini input the address of a link clicked outside the Java runtime environment... it was an app someone made which would basically copy the link to memory, then open opera mini and manually enter each letter by simulating keystrokes.

The problem is, which each version of Opera mini, the manual input method would need to be tweaked. I haven't seen anyone use it in a while, and it seems to be a very last-resort-ish way of going about this.