If you've played PNRP, chances are you've played other post-apocalyptic games such as STALKER or Fallout. Which brings me to the idea I want to suggest: Perks! I can think of a few perks that could change the game for certain players willing to spend an amount of EXP on them, or if they meet certain requirements.
-Quick draw: Take out your weapon 25% faster (Requires level 3 weapon handling)
-Good with your hands: Able to construct items 30% quicker
-Used to it: Reduced damage to radiation
-Sneaky little bastard: Hides player name box when crouched.
-I already ate: Slower hunger decay
-I'm not tired: Slower endurance decay
-Zombie slayer: Deal 15% more damage to Zombies (Scales with weapon handling?)
-Path of the Shinobi: (Requires Sneaky little bastard) move faster while crouched by pressing SHIFT.
-Grabby hands: Able to grab ledges (requires level 2 athletics)
-Hardkour: (Requires level 4 athletics and Grabby hands) climb up walls for a short time with HANDS equipped
-Butter fingers: allows you to throw your knife (Requires level 4 weapon handling.)
-Tis but a scratch: regenerate health faster while indoors.
-Master Assassin: Disables stabbing and dying sound effect upon backstabbing an opponent. (Requires Sneaky little bastard, Path of the Shinobi, and level 5 athletics.)
Those are a few that I can think of. Perhaps the almighty devs will put this into consideration? In the meantime, I'll gradually add more and more perks that come to mind. You're more than welcome to add some, fellow forum-goers.