Friday the 13th The Game - Perk modifying Hack
This would basically be something that modifies the percentages of your perks to ridiculous numbers like 9999% swift attacker, 100% sense avoidance, 100% thick skinned, 9999% escape artist, etc.
You might think this won't work but when they nerfed thick skinned, the perk only got nerfed in your inventory and if you kept it equipped it would stay the same. This means that you can have a perk equipped that isn't in your inventory (inventory is server sided), so you'd have to find a way to give custom perks into your "equipped" slots.
The thing is why would someone effort his time to create Cheats for a dead game ( currently under 1k Players online)?