Hmm, Ok I see your point Jowe.. I've been thinking.. What about the Blue pill giving x2 Karma for each 2 minutes you survive, or for the time being.. For example, The blue pill would come to effect on the last 1:30 Minutes, giving the survivors a 1:30 Time limit to survive and Gain a x2 or Higher bonus for Human Karma.
Red pill will pick Random Zombies and change their color to Purple, Which will give them the effect of x2 Karma for that time being, Which means for the time that it is Red Pill'd, Zombies gain x2 Zombie Karma for each kill.. Now, Every 2 kills they get would x2 it.. For example
Example killed Example omg!
Example killed Example (Karma x2)
Example killed Example
Example killed Example (Karma x4)
This way It shouldn't really effect game play Themselves, But It'd be a cool little "Bonus" or "Achievement" to get, I know some people might disagree with this because it Only effects your Karma, But if people were to suggest something else to take place rather than the Karma, then by all means please say, Otherwise don't reply with "I DUN' LIEK IT"