I’m not sure what fixed it, but after some rebooting and messing with other programs, I came back to it and it’s working great!
I was able to map left and right triggers to the left and right shoulder buttons on an Xbox controller. From within SteamVR, I launched the Archery game in “The Lab” (mine Lab starts directly in archery via launch arguments). I grabbed a bow and arrow and after a bunch of fiddling, I was able to shoot my first minion 🙂
Holding the Xbox controller seemed to confuse my Leap Motion quite a bit. I’m charging up my PS2 controllers and can’t wait to see how this works with them… both as buttons for the Leap Motion (my preferred setup) and also with the full PSEye style setup instead of the Leap Motion.