User blog comment:Armyman234/Treyarch hands over DLC production to Raven Software/@comment-1945718-20101202202949/@comment-1160347-20101202224414

Lightweight and marathon should be combined, because if they were 2 separate perk machines, that means more money spent, more running around, more clogged rooms. Yeah. Hardened would be a nice perk, so I can use a Sniper rifle to kill like 50 zombies with one bullet. And you should be able to upgrade your perks. Like quick revive(with more than 1 person) should be able to be upgraded so you can revive yourself when your downed. Juggernaut pro machine should let you be able to take like 15 zombie slaps without being downed. But to counter all of this, all machine will double in price(Jugg-Pro would be 5000 zombie points! Worth it though!)