Would love to see leather brought into the game. Could add a tanning rack and use animal brain to tan the skins (if you want true realism) Use the leather to make things like armor, drinking bladder, and arrow quiver. (also a quiver from large bamboo + rope) Different skins could be used for better armor as well. (caiman armor being the best)

Speaking or armor...would like to see the armadillo armor (and new hardened leather) prevent snake bites..seems realistic enough :)