An example of what you can do:
main
- light or medium wounds: Treat themselves no more than 2-4 times
- serious wound: Only Medic's help no more than 1- 2 times
- leg injures - immobilezes (OFP style)
additionally
- Severe injury can lead to loss of consciousness
- Injures of arm - affects the aiming, but the change of hands can normalize situation (You can make an animation shifting weapon (now the hand does not change when you shoot from the left shoulder))
- Injures (cured or not) affect to the speed, breath holding, carried weight
- Adding the effect of concussion
- Bots can react the same way
Sorry for my english, and thanks for ARMA3.