FME Server - Arcpy

What is the minimum needed files to be able to run Arcpy on FME Server. It should be possible to only copy the related python-files and libraries and not the complete ESRI-stack. Also after looking at this: http://fmepedia.safe.com/articles/How_To/Choosing-a-different-Python-Interpreter-installation  it would be very nice to define the python-interpretor in the workspace ithself ie: FME_SERVER_PYTHON = c:\\ARcGISpython\\ to make it ieaser to move between python interpretors and from desktop to server