I found what will (hopefully) be an easier out of bounds glitch with practice. I should also mention that Aaron mentioned that someone else may have discovered it so I'm not claiming I fully discovered this. I just may have found a way to do it consistently.

So, you turn off your flashlight and bring up the map and quicksave like normal. When you reach the top of the stairs, match your angle perfectly with the wall. you have to follow it PERFECTLY. If you slide even a millimeter to the right or left, it will not work. Once you're lined up, follow the stairs down. When you reach just ABOVE where you think you need to be, go ahead and turn into the darkness. Do NOT go any lower. If you continue to go lower, the environment spits you back onto the steps and it won't work.

Why does this help us? Because if you can do this consistently, we never have to worry about "falling down" again. If you glitch into the wall perfectly, James will walk as if he's walking down the stairs. You never fall, you walk down and into the darkness. I did it yesterday twice without even trying and then today I decided to practice and record my practicing. In 5 minutes, I'm pretty sure I figured out what you need to do to do it consistently. Just skip to the 5 minute mark if you don't want to watch me practice and screw up a bunch.

I didn't add it to the Guides page since I haven't consistently got it down yet but I think we can do it.