https://www.pcgamer.com/valve-now-lets-you-map-your-own-custom-controller-bindings-in-steamvr/

There are many different controller options that work in VR, and that can be both daunting for developers who want to support them all, and frustrating for gamers who feel the default control schemes are counter-intuitive. To deal with both issues, Valve is rolling out a new SteamVR Input system that allows for custom controller bindings.

"This new input system also allows developers to adapt their games more easily to diverse controllers. Developers control the default bindings for each controller type, and can offer alternate control schemes directly without the need to change the games themselves," Valve explains.