ploopy trackball nano scroll mode by wiggle gesture
wiggle the ball left/right to switch to a scroll mode, the ball is then simulating a mouse wheel
https://www.youtube.com/watch?v=wvuZpBOGxHc
soldering a switch to the bootloader pins can also be hold to scroll
qmk binary: https://github.com/pandrr/wiggleball/raw/refs/heads/main/ploopy_nano_wiggleball.hex.zip