Hi.
I found a little time to create new demo – managing KML Layers by Group List
http://joomla.zhuk.cc/index.php/zhgooglemap-demo-feature-managebygroup-kml
It is simple, like a placemark management:
– create your placemark groups
– assign this groups to paths with KML layers
– enable in map details management by placemark group list (“Placemark Group Control”)
– enable in map details “Manage Paths”