IDL is in the render settings.  I use the Render Firefly script under Scripts>Partners>Dimension3D, which in addition to giving control overmore parameters,  allows one to save and load custom render settings.

Speaking of scripts, you will need the MaterialMods>changeGamma script to set up most materias' transparency and bump maps to look good in renders using Gamma Correction, which set at 2.2 by default.  To use the script, use the value of 1.0, select "All props and Figures" and then "All of the Above" which will uncorrect the appropriate maps.... 

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