A picture is worth a thousand words - This is my E61:
Since the OS is multasking, you can -sort of- work around the option.
Keep a note open in 'edit' mode.
Then assuming you are browsing in language A, you can swap to
the note, change to language B, then swap back to the browser, and type in language B. It might refresh your page, though, so it's not 100% reliable.
I ordered my E61 from plemix. It's probably a mistake that my Finland E61 has a chinese bios.