Disgruntled

why link it to doors and windows, lets have some MGS wall tapping to distract zombies throwing pebbles could be a cool addition too, small enough not to break a window but loud enough to 'ping' a noise across the street.

Honestly I cant see it being worthy of a trait, as a vegan I can say that i'd have way bigger things on my mind in a zombie apocalypse. Probably the biggest affect it would have is meybe a bit of indigestion for meybe the first week as the body adjusts, but wouldnt that be true of anyone, its not like a typical meat eater is gonna be accustomed to the diet of a zombie survivalist