The current PCB interface does not support the common customizing concept of SDCORPCUSTOMIZEDIR, SDSITECUSTOMIZEDIR and SDUSERCUSTOMIZEDIR. Instead a customization file needs to be present in the current-folder when launching the module. I think the latter is not a practical solution. It should not be too hard to incorporate the common customization concept into the code. I believe the PCB module deserves this, after all these years that the module exists!