This is another boring suggestion by that guy with too many ideas floating around.
But this one's better than the other old boring, generic suggestions - here I am suggesting the addition of awesome, helpful medical-related features. Specifically:
1. The First-Aid Kit
These kits are made with special bandage-material, rubbing alcohol, pliers/scissors, glue, and healing-catalyst gel-material. Each kit lasts for 32 uses, and has some special code-stuff that makes the user have to wait 5 seconds orso before using it again.
The use of this kit is to heal players who are damaged and need to be healed quickly. It can be used by a player, on another player, or on some animals. When used, it instantly heals the player/animal it is used on, and the amount of health restored depends on the tier of the kit. Tier 1 kits would heal 1 heart per use, tier 2 heals 2 hearts, etc.
2. Steroids/Antidotes and Syringes
Syringes would be special devices used to inject Steroids which have a lasting buff effect, and Antidotes that instantly cure poison or wither effects. Steroids can grant extra speed, strength, night vision, regeneration, and much more, but can not cause invisibility, fire resistance, or other magic-like things. Antidotes just cure Poison and Wither status ailments, as described before, but a specific antidote is needed for either.
The steroids/antidotes are made with a special, expensive machine. And the syringes are very expensive too. Syringes are made out of Iridium Syringe Needles (iridium rod + rubber in an assembling machine) and a small glass tank (small glass cube + rubber in an assembling machine), and are single-use only. Iridium is used, because it retains great strength even if in the shape of a tiny, thin tube, whereas most other materials could break easily when used for such a purpose.
Filled syringes are only stackable up to 1. But the filled tanks and needles are stackable up to 64, and store-able in a medical case. When the player is ready to use a syringe, the player has to take the needle and the filled tank, and craft them together into a syringe. Using a syringe will grant the steroid/antidote effect, but the expensive syringe will be lost, because it's a dirty needle, and balance reasons.
Machines that synthesize/process any steroids/antidotes, and the machines that create the syringes, must be kept sterile at all times, and slowly become dirty, and often have to be cleaned, unless the machines are inside a Clean-room.
3. Medical Cases
Medical cases are just cases that hold medical items. Medical cases hold up to 4 first-aid kits, and 14 stacks of anything else (syringe needles/tanks, etc. - this tool would make it easier for the player to carry medical items around for use in "the field" (deep, dark, forsaken mine-caves). All medical items have to be manufactured elsewhere, and can not be crafted without machines, thus the medical case can not allow a player to fill syringes or craft first-aid kits.
That's just about it for now. There will be many more ideas to come, but my head hurts right now, so I won't be suggesting any more for a while. Feel free to review this suggestion and give any comments that you feel would be helpful.