If you are using the PhysicalSurface node, you have access to displacement.  But you need a significant resolution for it to work correctly.  Don't even bother with Cycles ATM, it's trickier to get the right values for displacement.

@ADP, I peeked into that MC6 file and I see no reference to the PrincipledBsdf node anywhere in the coding.  It looks like it's missing nodes.