For those looking to DIY the cheats via Cheat Engine, you can search for float values between 0-100 (decimal included) for the hidden needs; such as bladder, hunger, thirst, etc. Search for unknown initial value, then use increased value and decreased value. I was able to freeze the bladder, you must find all three floats and set them to 0, make sure you tag them as active. Assuming it's the same for all of the other needs.
For endurance and other similar stats, they're also float values if I remember correctly. Easier to find due to specific numbers, just search for the next value while training in game to find it.
That being said, this game really needs a walkthrough, because even with fully locked needs I can't progress because I have no idea what to do or look for. The quest descriptions are so vague, and I'm currently stuck after you get the key to the campus. It says to sneak in at night but it's so fucking dark I can't possibly find any objects, let alone navigating the poorly constructed labyrinth of a school. Otherwise the game just seems like it's going to take ages to play through. And this will only get worse with new updates.