Either you’re using a mod that significantly increases the hitpoints of prey animals, or you’re using Frenzied bow and blunted arrows with 0 agility.

This applies to most weapons. A sword is a lethal weapon but requires practice to use effectively.

There are reasons why rank and file across the world used spears. Ease of use was one of those reasons.

To be honest, I don’t know. But before making your mod, I suggest you should find out, or you might be in for a nasty surprise.

If you have rules that limit player activity, then we don’t really have a good way to assess how any modification to game mechanics would affect your gameplay, because there are factors outside the game involved. It’s a bit like asking our opinion about an aimbot, and then telling us that your players are allowed to use only their left hand (or right hand if a left-handed player) to control their character.