I would like to ask for a PVP system. It would be purely optional and opt-in via either a flag or by using/wearing certain item.
This would expand the fun players could have for themselves, from allowing for “friendly fire” during a hunt, meaning people would have to be cautious where they are aiming or standing, to player-made gladiator arenas. I would certainly be willing to build some arenas myself if such system would be added and it would increase the marketability of the game (one of the reasons Minecraft is so popular are various minigames people have made, many of which involve PVP).
Again, it would be purely optional and opt-in (turned off by default) so if you don’t want to be killed by players, don’t flag yourself for PVP.