No documentation yet, but a new release adding functionality to the Indigo Instance object. The export routine was rewritten, to make instance export easier and faster. The Indigo Instance supports nesting now (instances of instances). Get it here.
Read the Changelog:
Cindigo 2.0.9
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* implemented alias_material for previewing linked materials
* gamma fix for imported materials with RGB
* implemented pigm import and linking
* exported materials will always be exported as pigms
* fixed emissive material icon for R11
* quickrender does not rely on the config file anymore
* Sun and sky will now be always drawn to a seperate layer than other lights
* fixed material inheriting and materials with selections
* added thread_priority command line switch
* added sun and sky layer
* fix for nested instance loops
* fix for transformaton issues with non-uniform scale
* nested indigo instances will now be drawn
* implemented instance export for the indigo instance object
* reworked the export routine ^again^ to make instance exporting easier
* small changes to motion blur

