The linked video didn't play, but I believe I know what you mean. I've added something more as well. I'll set a limit for the flashlight zoom. The flashlight zoom and use isn't necessarily a thing for this game at this point, but I might make a level that more requires/uses it. You'll see what I added when you press the L)earn key when playing the game. It will L)ist commands.
briefly though,
- use wheel to adjust flashlight
- hold shift key + use mouse wheel to adjust zoom
- hold control key alone to auto move forward instead of using WASD