I played stress test last night for about 4 hours and I got this idea that would be pretty cool imo. So when you're in PvP your character could enter an adrenaline state where you can sprint for longer distances. But the downfall will be that you hurt yourself but yet again don't feel it due to adrenaline, wear your character down, dehydrate and starve. Then when the adrenaline state wears off you have to spend exceptional amount of time to repair your character. But as a soft skill the longer your character is alive the more immune you come to this and adapt to the PvP environment.