sudomod

I still plan on using a USB hub but I would just like to free up space if possible. Is wiring straight to the Pi0 gpio pins for input from the button pcb possible? And if so is it difficult to get it configured for use for someone that really doesn't know anything about configuring the pi itself or is it pretty simple?

Thanks in advance for any tips or guides I could be directed to!

Nevermind I found the answer in another post by @Chedda thank you.

https://learn.adafruit.com/super-game-pi/initial-setup

I think this should relate correctly to retropie

Yeah, I wired all buttons directly to the pi and skipped the teensy as well. Everything works fine, A buddy of mine did the programing, did not take him long, this is the guide we followed:

http://www.sudomod.com/forum/viewtopic.php?t=57

You might want to take a look at that thread http://sudomod.com/forum/viewtopic.php?f=22&t=57

I also skipped the teensy (and dunno WTF it is BTW, just kidding); you can safely wire directly to the RPI GPIO because of the internal pull-up.
Then you can use retrogame program from adafruit; it's really easy. It worked like charm for me on two different projects.