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This script was designed to simplify the making and manipulation of the renders layers, it only works with Mental ray as render engine. For this reason, as soon as this script is loaded, it automatically verifies if mental ray is loaded and assigns it as renderer.
I created it to work faster, after dealing with a lot of people who can´t follow a workflow. It also has some other tools that are useful in every day work as a generalist. It´s currently on trial period , and it is the first script I developed, so it may need some modifications.