I want a gun that never has to charge for crits.
Penalty being either, if you miss, you lose either all or a large portion of your life.
Or, its like an experimental sniper rifle, unstable etc., if you get shot while zoomed in (by anything, pistol included), it blows up in your face and kills you.
Another idea that would be awesome imo, is the ability to take a much stronger version of his secondary weapon (assault rifle or something) and in return you cannot snipe. The sniper's machine gun has always been my favorite weapon, but its just so damn weak.