My activesync isn't working, but I think it's something like this:

Browse to your Opera Directory, not the one on your storage card, the one under My Device > Application Data > Opera

And copy Opera.ini to your PC. Now open it up using notepad and you can modify the changes that normally point to My Device > Application Data > Opera > andwhateverhere, to Storage Card > Program Files > Opera > sameasoriginalthinghere

You can change just about everything in there to do that, and it will free up a lot of space from Opera's browsing.