In the vanilla game falling would generally leave Geralt completely unharmed, or instantly kill him. I have created my own falling damage formula to use instead, with a steady increase in damage over distance. Additionally this removes Geralts Max HP from the equation, so a tougher Geralt (say with a bunch of green mutagens) would be able to survive a higher fall.

This modifies the actor.ws file.

Note: This mod also affects enemies, making it very difficult to kill them with falling damage. I'm currently trying to find a workaround.

I also added a readme detailing how my formula operates, and how you can quickly modify it yourself if you wish.