Dreamcast has a soft reset to intro splash screens and was wondering about leveraging MC Cthulhu

I was able to get the MC Cthulhu to work with my Dreamcast and Seimitisu buttons and I’m really happy about it.

If I were to press all the buttons on the Dreamcast controller at the same time, it goes back to the main menu. I thought how cool it would be to wire a button so that if pressed it’ll go back to main menu and cycle the intro videos like an arcade game would.

For those of you experienced with the MC Cthulhu, how would I go about wiring 5 terminals (A,B,X,Y, Start) to one button when these terminals are also being wired for the single button inputs?

Nevermind folks. I got another question that’s more important than this one and if mods can close this, great.