2010 - released a driver that allowed support in pretty much every mouse + keyboard game
2015 - Steam Controller
This one’s really funny because it goes the other way. By this point two-stick + aim assist controls for FPS games are really standard and pretty good. It uses touchpads to make it easier to play mouse + keyboard games on the couch
Shoutout to the dual N64 controller config for Goldeneye and Perfect Dark