That would be perfect.I don't want them either but to be completely honest only one health bar ever showed at a time. You only saw it when your crosshairs was on the enemy/animal/vehicle and only if it was in range.
I suggested something similar a while back. Some sleepers should just be dead and laying there. Most buildings should have some.Unfortunately once a zombie goes down, they tend to get right back up, especially now with them getting up much faster. Not like the early days of Resident Evil where a downed zombie might just be playing possum and waiting for you to get close enough to take a chunk out of your calf muscle. Now that would be an interesting addition to the game. The ultimate sleeper. Play dead till you're close enough to attack. Should make for some interesting pants wetting moments.