thought/suggestion:
Have one random person become a doctor or a policeman.
-- Doctors can cure one infected person, but this makes them vulnerable to infection as well. Curing would give more points than a kill (3?) If a doctor doesn't want to cure an infected, they can instead heal a teammate with the same mechanic for 50hp.
-- Policemen are given a firearm. That said, a lot of people get really upset at the slightest mention of GUN on the server, so lemme clarify before you shoot it down for unbalancing everything because it's ranged and oh no!
• They get ONE magazine, aka roughly 7 rounds
• They don't have any melee capability
• The gun is severely inaccurate, so they won't be sniping zombies from across the map (not without a whole 'lotta luck)
There have, of course, been a few lot of requests for a new map, or maybe a map cycle. Provided the server stays hosted, and players stay interested, I would be willing to host a server to work as a community on a second map. If that goes well, I would be willing to continue making maps for the server.