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Wow dude you are providing so much useful feedback. I love what you think about 

When you turn a npc into human/zombie, there will be a chance he can have a random quest for the hero, so the hero can talk to him/her.  The idea was to create a random generated quest system in the game, although it's in a very initial state right now.

Currently giving a zombie brains won't increase his favor to you but I think this is a very good intend, I'm thinking about adding it as a new feature.

As for "repair kits" and chips, yes that make sense!