[pbmonster]

Not really. Can't really map a touchpad as an analog stick. Can't map a gyro as a joystick. Can't take XBox rumble and map it to the Steam Controllers haptic feedback.

Can you hack it together in theory, get something working but making sacrifices left and right? Sure. But why would Valve want to do that? Use experience would be incredibly bad.

But give it time. There will be a standalone driver for Windows eventually, either from Valve or from the community.

[mateuszf]

It's possible already. Using an open source app called PadForge. I've setup a profile that works without steam and emulates xbox360 pad. I've used it without problems in Forza Horizon 6 which is an UWP / PC Game Pass game, also in various emulators.

https://padforge.org