Genesis 3 button controller

As you might have surmised from the last post, I've gotten a sega cd. To get all of the cables necessary, I had to get one with a genesis attached. So today I've been going through and cleaning everything. The expansion port of the attached genesis was EXTREMELY oxidized. It took me about three hours to get it looking respectable. And I found out that the fuse in the sega cd was busted. My repairs are on hold as I wait for a fuse holder, but the system also came with two three button controllers. Growing up I always used a 6 button controller. Perhaps it's because my hands are bigger, but the three button feels so right and going back to the 6 button feels claustrophobic. However, the SNES has a much better layout for everything except fighters. The shoulder buttons just make sense. But, it's a bit unfair because the genesis came out in '89, when it's major competition was the NES and the Turbo-Grafx 16, both having two buttons. Still, I'd like to have a bigger 6 button.