This suggestion is mostly for making the game challeging it would be great if you share it with others.
While Voting a map or gamemode you can select the difficulty of each gamemode here is a example.
Example:
Rapid Infection:
1. Normal (self explanitory).
2. Moderate : The zombies are buffed a little.
3. Hard (the same as hardmode just more zombies).
Difficulty applys for
1. Ai zombies.
2. Amount of Zombies (player controlled).
3. Stats of Zombies (both AI and player controlled).
4. And restrictions of some items and feature (for a example if its hard you cannot bring a defib with you).
Also every kill made changes based on the difficulty
for a example a normal zombie rewards you 10$ If your in Moderate you earn 5% more then the orginial, if its Hard you earn 10% more.
The Difficulty options can be added in VIP servers and you can optimized stats and difficulty.
to prevent this for being too overpowered here are some restrictions.
Brutes Health Cannot be over 5000 nor their damage over 240.
Tickers Health Cannot be over 400 nor their damage over (???).
Leapers Healh Cannot be over 150 nor their damage over 20.
Edgars Health Cannot be Over 175 nor their damage over 15.
Diggers Health Cannot be over 400 nor their damage over 20.
Elemental Health Cannot be over 400.
Stalkers Health Cannot be over 250.
Im not going to change about the walkspeed or the staminia because thats just too much work and its fine how it is.
Also this feature can remove the gamemode "Hard" as its useless.
Tell me If I should nerf or buff.
(Also Constructive Criticizing)