PROBLEM: For map services secured with the ArcGIS Token Server, there is no KML export. The "Generate KML" links on the REST pages are missing.
SUGGESTION: Make KML export available with the token-secured map services.
I would even be ok with building my own connector, but right now, there is nothing to connect to! As soon as I secure the map service (or it's folder), the KML export options are gone.