So, after being annoyed with not having the supplies to handle infected bites, I suggested cauterizing wounds with a heated up knife or other bit of metal. Seems that made it in to 0.4, cool enough.
But then I got to thinking that First Aid skill is only really useful if you find and want to install some CBMs, and that the infected bites were a game changer in terms of when I felt ready to engage zombies. So, why not have more of that?
First up is bleeding wounds, which already exist but are fairly uncommon, treatable by a rag or a bandage as it is (and of course cauterizing it) How about something similar, open gashes, which might become infected like an infected bite, or might cause you to bleed once in awhile, plus, do you want that thing leaving a huge scar? Well, of course you do because you’ll look like a badass, but still.
The fix would be to sew it shut with your sewing kit or bone needles, or superglue it closed like Sabu.
Broken limbs could be splinted with 2x4s and rope or string until they heal, perhaps some sort of sci fi spray-on cast that you find in drugstores and is usable with less First Aid skill.
Getting shot by soldiers or bandits or aggressive survivors might occasionally leave you with a Bullet Wound which would require you to pull out the bullet with something, and then turns into an Open Gash (Perhaps this is taking it too far)
Getting stung by giant bees might leave their stingers in your flesh which would cause pain and possibly do more damage unless you remove the stinger similar to my suggestion for Bullet Wound.
And finally, when you walk over broken glass, rubble, and metal wreckage with no shoes on, you could occasionally contract the Hurt Feet disease which slows you down until you have time to sit down and pull shards of glass out of your feet a la Die Hard.