zm_zerbes_demons seems ok but it edits one sv command which this may made it push items.
Code:A Note to Server Administrators: This map has a point_servercommand inside it. Without it the boats will not work and the cannon won't function properly. If you have a point_servercommand override plugin, then you'll need to make a .cfg for this map with sv_turbophysics 0 in order for the boats and cannon to work.