How about having locked doors - you would have to use your axe to smash them open to gain entry. Maybe the noise could attract lots of nearby zombies. Houses with locked doors may contain zombies and / or more valuable loot.

Yeah - the looting zombies is obviously a stupid idea - I was just having a bit of fun. However - if the game ever seriously ramps up the zombie population, e.g. suppose you could see 20 or 30 of them strolling in your local vicinity - then chained zombies like the walking dead would be useful. A way of staying alive and saving ammo / medical supplies.

A handcuffed zombie could be attached to a bunk in a military base - give looter a nice surprise when they open the door. As it is the zombies are very easy to deal with - even if you are attacked by two at the same time.

Yeah well I'd like to be able to capture and train zombies to do my bidding. Maybe have a team of four or five zombies go marauding into town and fetch supplies / attack the odd human for me - yeah that would be cool. Or how about using zombies like human guard dogs? Or even better - a non - human shield. You could stroll around within a circle of protective zombies - not having to worry too much about imminent ballistic death.