You set the ForceNeoGeomode to Unibios and then when you load a game you will see the green Unibios screen. At the screen press your A+B+C buttons that you have mapped for the FBA core, this will bring you into the Unibios configuration screen. In here you can make all the adjustments like region and AES / MVS among other things. Follow the on screen instructions for the Unibios settings, once you are done press the C button to exit the Unibios and into the game. You should then be able to close the game and when you reload it the settings you had set previously should be there, again though this will have to be done per game as far as I am aware of for now.