Cheers everyone. I'm on Lubuntu, so I used l33t4opera's method and it worked like a charm. I'm very, very grateful, thank you.

Hello, i have a wonky laptop keyboard, more precisely the left key is non-functioning. Normally I manage, but it seems entering the opera power user mode is one of the rare times when it's necessary. I was wondering if there was a method to do this any other way, by modifying the preferences files perhaps. I'm using the 32-bit opera-developer 32.0.1899.0. Much obliged.