map the unused rp2040 pcb pins to buttons.

[itsnoteasy]

I have built this project in a different case. however, there's not many buttons no back/ forward and you have to choose between middle click and layer shift. I'd appreciate it if you could map at least one extra button to the gpio, they're unused anyway. 2 to 3 buttons would be great. I like the layer shift because it prevents back/forward from being hit by accident.

I have tried to compile the code, but couldn't get the build environment setup. sorry for hassling you.