Welcome to the forums! I hope you enjoy it here
First of all, you should probably separate some of these ideas into different threads. Second, I personally think that stuff like campfires and medicine is pretty far fetched for a quadropedal species, though dens and tunnels sound really cool. Thirdly, Niche isn't going to get anymore updates, but the team (and us forum members) enjoy reading the suggestions anyways and sometimes they even inspire aspects of future games, so keep posting!