I am sure any experienced player of Arma would be familiar with the struggle of accidentally treating yourself during combat, whether you're trying to get into a car, open a door or any similar action, only to find yourself shot as a sitting duck while you helplessly bandage your knee.

It would be good to give the player the ability to cancel this type of action. For example, if I am healing and press WASD, it would cancel the animation and allow me to run. I feel this would be a small gripe a lot of players would experience. You could make it waste the first air kit, or not use it at all depending on your balancing ideas.