I have already sent this idea to Nelson via email, but he told me to post it on the forum.
“The Blue Moon”
I’ve read that Nelson wants to make the zombies free roam and I couldn’t agree more! But I think it would be interesting to have a rare event called the “Blue Moon” or something; during this event (most) zombies are unable to move unless provoked (like the current game). I think this would allow players to have a break against the zombies and would allow them to collect some basic loot (nothing rare since that completely nullifies the difficulty of the game). I also think it would be a neat throwback to the original game. (There could even be an easter egg where some zombies make the original moaning sounds)
(This is just an edited excerpt from the email I sent, I have more ideas concerning Unturned II, but this is the idea Nelson said he liked)