Really? I would have thought that the bottom row would be the main buttons used. I originally had the botton row mapped to MAME's "Button 1" and "Button 2". I never would have thought that the middle row's first two buttons would be the main buttons used. I thought that the bottom two buttons would be the most convenient to play shmups and old classic games that only utilize two buttons. But I guess I was wrong. So basically the bottom row of buttons never gets used because there's not many games that use more than 6 buttons.
Thanks T0M and thank you too Stiletto for informing me how to rename the file.