Hidden options (NTSC version):
Hold A + B + X + Y on controller two and reset the SNES. Continue to hold the buttons and choose the options selection, then the custom selection. Several new selections will appear on the custom screen.

Hidden options (PAL version):
Begin game play in competition mode. Hold A + B + X + Y and reset the SNES. While continuing to holding those buttons, choose the options selection, then the custom selection. Several new selections will appear on the custom screen.