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Colleagues, does anyone know how I can change those settings?
I believe that you will need to find the file "Constructions.xml" within the directory "...\Program Files\Autodesk\Revit MEP 2012\Program\" assuming, of course, you're using RMEP 2012. Open the file in a program that can read it, such as Microsoft Excel, and then you should be able to add to, edit, and change these values as you see fit.