Sword + Gun Custodian
The idea behind the custodian is to have it reward the raider for using both a melee and ranged weapon. Destroying stuff with melee gives bonus to ranged and vice versa. Then destroying traps/guards with both repeatedly gives a bonus. Here is what I would recommend:
After destroying a trap or guard with a ranged weapon this perk activates for 8/10/12 seconds. If you destroy a trap or guard with a melee attack while the perk is active then the last used ammo is returned to you and the perk deactivates.
After destroying a trap or guard with a ranged weapon this perk activates for 8/10/12 seconds. The next melee lunge attack while this perk is active has an increased range of 4 meters then the perk deactivates.
Short Range Explosion:
After destroying traps or guards with both a melee and ranged attack, gain a token. After you gain the 3rd token, all tokens are consumed and you create an explosion destroying all traps and guards within 4/6/8 meters of you.