I'd like to suggest adding a virtual interface binding menu and workshop to SteamVR.

We could add an overlay with virtual interfaces like buttons, joysticks, throttles and steering wheels. A workshop would make this self-sustaining by allowing creators to add new interfaces and profiles/modlists for particular games.

This would strongly complement flat2VR software like VorpX and UEVR while simultaneously opening up an even larger library of games to become quality VR experiences and lessening the need and therefore demand on current developers to add dedicated/quality VR support so they can focus on creating quality experiences, and surely adds the potential for an unexpected but much appreciated boost in profits for developers and publishers of older games.

It doesn't have to end at racing/simulator applications after all, you could add in a VRIK and weapon overlay with item inputs in the shoulders and hips and gesture inputs for games many older games like Thief or Oblivion.