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!