Im curious if there is a way to use an hdr image for the sky light. i know this is supported in the beast stand alone.
apparently you can, in a custom beast xml file.
sadly there are no examples i could find, but here is one.
IBL C:\lightmapTest\Assets\your_image.exr 1Example for?
if you mean the config file, thats outputed by unity for your modification but you can’t access many of these things right in the editor.
an example for using a texture for skylight. that bit i pasted in shows how in the BeastSettings.xml file.
Well what you have there sounds like you have all you need, aside of pasting the part into the xml unity generates for beast rendering 
You can not specify it in the editor though