Right now, you can already enter your MB login info in the settings. When you want to setup fingerprinting, you have to go to the Acoustid site and login by entering those details again (or use OpenID, but that's not what this ticket is about) and then copy the API key to the Picard settings.

It would be nice if there were a button which would use the MB login details from Picard to fetch the API key from Acoustid and then enter it into the field. That would make it even easier to setup.