I believe these plugins should be added to the server.
Clockwork planter:
http://www.curse.com/bukkit-plugins/minecraft/clockwork-planter
This can be used to help automate farms.
SilkSpawners:
http://www.curse.com/bukkit-plugins/minecraft/silkspawners
This can be used for members to be able to do more with spawners if they can find them.
TreeAssist
http://www.curse.com/bukkit-plugins/minecraft/tree-assist
This can be used to keep trees around automatically on the server, and help declutter areas where trees were planted.
If I have more ideas, I will post them.
Thank you.