I believe that two changes should be implemented that involve doors in game... 1. Players should be given the ability to lock/unlock doors from the inside only.... 2. Zombies can never go through locked doors, but player characters can go open them by using scavenged lockpicks. This would encourage night time play and potentially permanent town and camp building as camping with actual light wouldnt mean instant zombie swarm on your butt, if your locked safely in a house, and player characters would have to break and enter, whereby they would be easily detected and dealt with. An Maybe attach it to an in game key spawn or something of the sort... just a suggestion.. Hope I got the basic idea across.