To whom it may concern...

A game addition I that I think would improve DayZ a lot is realistic natural night vision.
For example: Players sight improves in low light conditions over time (e.g. 5 mins) to a somewhat useable greyscale.
Also if a player looks at a street lamp/fire/flare their night vision deteriorates.
Most importantly if a torch is shone in the eyes of someone using natural night vision it will cause brief temporary blindness. This will allow a realistic defense/escape mechanism for when "bambie" meets "geared up bandit" at night.
This easily may deteriorate into players ambushing each other with torches, then axe in the head scenario, but as long as the blindness was only brief the advantage shouldn't shift too much toward the torch holder.
Real world - Dazzling weapons are an effective tactic.

For your consideration...