All of your perks sound great except for one thing they are kinda getting a little... fake because honestly there will never be a knife that has range longer than your arm. well, unless you throw it. but already the game perks are kinda make like the one where you drop a live grenade when you die. after you die you can't drop a grenade!
Dual wield; Wield a weapon in each hand. (Pistols, Uzi and Skorpion only.)
Ninja; Run faster, jump higher, knife quicker.
Bomb speacialist; Defuse/Plant bombs twice as fast.
Dual Attachment; Self-explanatory.