A user on Twitch.tv named "Mattn19" posted a suggestion on a streamers chat and I felt the idea was good enough to go in the suggestions. "Mattn19" and I believe that a herd or mob of zombies about 10-30 zombies large would add even more need for alertness. When "Mattn19" said it he said "There should be roaming herds." So rather than the herds or mobs just stand around in a big group, perhaps they walk the road through a town or just down the main road near the coast. Or maybe on any road. But, I'm not sure how coding that would go considering you must be close to some area for zombies to appear. So honestly they wouldn't really be "Roaming" so much as spawning in a giant horde in front of you then walking down the road in no specific direction. I'm sure it would add fear into the game. Imagine it, you're in Chernogorsk and you turn the corner of a building and BAM. There are 14 zombies ready to kill you. Also, if there are geared people that do nothing but run around and be geared they might want a challenge! I think it'd be pretty fun to take down 14 unsuspecting zombies with a hand grenade or two.