I would honestly prefer the traditional slow moving walker type zombies to be in DayZ. Yes it would make the game easier but they could do things to compensate like just add more of them in game, specially in towns and cities, and maybe give them the ability to shamble at a slightly faster speed towards you to let you know its aggro'd to you, but keeping the hoppers as they are would be fine. Cause in reality if a dead body were to come back to life as a zombie the rigamortis that sets in on the dead body would prevent it from being able to come at you like a dam olympic sprinter. And having traditional slow zombies in the game would mean they are better at sneaking up on you, I do not know how many times me and my friends have just been chillin in the forest cooking some meat our guard a bit lower and relaxed when unexpectedly one of those crawlers comes out of nowhere and almost manages to sneak right up on our asses and those moments were some of the most scary, awesome, and hilarious moments ive had playing with my friends; crawlers, seemingly the least dangerous of the zombies in DayZ can also potentially be the most dangerous when your not paying attention to them, now imagine if that could happen even moar often. Maybe have a few zombies in the game with the ability to sprint like the ones now i dunno, but for a true zombie apocalypsey feel I'd like to see moar traditional slow walker zombies.