I use a PS5 controller paired wirelessly with my deck. I think the touchpad just worked for me with no extra settings (apart from picking a steam input configuration that supports it) but in practice I almost never use it for gaming.
Not sure what chiaki4deck is but I don’t believe it’s necessary for PS5 controller support.
Update: i may have installed something for gyro support at some point but it wasn’t chiaki4deck
Focuses on garbage these days