Thanks all for the rules, I do love the TWD, but feel the zombies are too static, the kill zone is fine, but I've increased the pain by on noise ALL zombies within 10 inches move towards the noisemaker, and 20 inches for mayhem, it may be better on larger tables, currently playing in a 6 by 4 town, if playing on a mat id keep to the rules. I've also made clumps of zombies who move together.
Like the idea of rolling per room as well.