I use driver4vr so just used the move function in that. I don't think you need a controller in that game (unless they changed it), you just need to be able to lean forward to look at the photo.
You need some kind of positional tracking. I just fake it. You can also use psmove service.
Or maybe even use SteamVr Advanced Settings and psmove to crouch, without real positional tracking. The game might pick it up as a lean.
Basically, yeah you either need driver4vr, positional tracking, or motion controls to crouch. I was able to play the whole game.