A few friends and I recently got into vintage story and love it so far, we all had a similar thought to add some form of butchering system as there is already a mod that does such a thing. Currently hunting does not feel very rewarding and just feels like you massacre dozens of creatures for very little food and resources. Implementing some form of butchering system to get much more out of an animal would be nice, and maybe you could counteract the amount you can get by making the spoilage a little harsher. This would force players to use the food preservation systems within the game, and also helps provide opportunities to add things like meat smoking, as currently you don't get enough meat out of creatures to really justify that kind of system.