I haven't watched any runs (so I don't know if this glitch is known already and/or useful) but I was playing through the game casually and something interesting happened. I was able to pull up my pause menu and the "PC" menu at the same time, leading to a bunch of weird interactions. IDK how I did it, but I have clips if anyone wants to recreate the glitch and see what may be possible.

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Did you find any way to consistently replicate this? I tried for several hours but sadly I just cannot seem to get the backwards walk you got that may have triggered the glitch. Do you still have the save file from back then to share?

It only works on chapter 14 and 16, stand in between wormon and the wardrobe, it will push you either towards the PC or away from it, to get this glitch you must stand so you get pulled towards the computer then open the menu and press the interact button as soon as you could interact with the pc (You may only close the menu if the prompt to open the PC doesn't appear, otherwise the glitch will end)

To document the latest finding regarding this here as well: I did find a way to replicate this in both games and found some major uses for the resulting menu glitch. It put all into a video guide: