The documentation for the IGDS (DGN) reader states that "Design files consist of a header, followed by a series of elements. The header contains global information including the transformation equation from design units to user coordinates, as well as the dimension of the elements in the file"  But apparently it is not possible to read the header information with FME. Obviously reading scale and coordinate system information is important if you are trying to automate conversion of CAD to GIS so this change would be very useful.