Hey, no problem.

Yes - the depicted side buttons channel into just one of the rear-side pinouts, and even then I think each side can support many more than just two inputs. I believe there are a few examples on the site and repository, but those resources still need to be built out some more.

I'd recommend reaching out to the designer directly. He's pretty active in his discord server, though if you'd prefer not to use discord I'd be happy to ask on your behalf if you have a concise idea of what you'd like to do.