Is your feature request related to a problem? Please describe.
Steam Deck gyroscope support has not been added yet, due to the fact that it wasn't exposed outside of Steam Input. SDL has finally implemented a method for exposing the API here.

Describe the solution you'd like
We should either use the API exposed here to implement native gyroscope controls on Steam Deck, so that it has feature parity with every other controller compatible with this mod.

Describe alternatives you've considered
There is also SteamDeckGyroDSU, plus the current method of emulating Gyro as Mouse via Steam Input.

Additional context
If we're using SDL3, the corresponding PR is here.