How do I enable this for my server?

[Billybob]

Read the part about the -P switch and the -M switch in the server switches section,

ie
-P kbe means kick, ban and coop can be voted by non-admin
-P KBE means kick, ban and coop can only be voted by admin

also you will need to make a dir called incoming inside the /assaultcube/packages/maps/servermaps/ folder to receive the maps uploaded to the server.