I agree. It would add a real challenge to not know how your wound is going to effect you. As it is, I simply hit auto pilot as soon as I start to pass out.
Suggestions:
Vary length of time (3-7 seconds)
Speed of loss of conciencence (from the current to almost instant).
Loss of being able to swivel head on all directions.
The longer a pilot wound is evident, the longer and more severe the handicap.