Want a small Plugin (WILL PAY)

Looking for a plugin maker to add these 3 things to this plugin Please will pay up to $30.


Please add these 3 things to this plugin if you can.

http://dev.bukkit.org/bukkit-plugins/dayz-plugin/
What to add:
1. A config of a percentage of how many items spawn in chests that auto refil every 10 minutes
2. only zombies spawn, (no other mobs except animals)
3. Zombies actually ATTACK players