It is possible to show a sidebar with a kml-file. You have to switch the kmlrenderer to GeoXML (of Lance Dyas) instead of google. Also you need to provide the location of the sidebar and the width (version => 2.11d).

{mosmap kml='http://tech.reumer.net/images/florida.kml'|kmlrenderer='geoxml'
|kmlsidebar='left'|kmlsbwidth='200'}

!Warning! JavaScript must be enabled for proper operation.

Also possible with an kml-file outside of your domain with included a networklink and have directions (only renderer GeoXML):

{mosmap kml='http://www.schon-versichert.de/joomla/googlemaps/australien2.kml'
|kmlrenderer='geoxml'|kmlsidebar='left'|kmlsbwidth='200'|dir='1'}

!Warning! JavaScript must be enabled for proper operation.

If in the sidebar the folders aren't open at initial start then you have to edit you kml-file. You have to add in every <offer> tag after the <name> tag the following:
<open>1</open>

Then the folders will be open at initial start.