I found the commands you listed in the libManager.pdf from the IC5.1.41 documentation, but it doesn't appear in the IC6.1.5 documentation. These work for IC5.1.41, but those variables don't seem to affect Library Manager in IC6.1.5.
IC6.1.5 Library Manager seems to indicate that all customizations are done in Skill in the cdsLibMgr.il file. I can't seem to find this file.
Anyone know if there is a default/example cdsLibMgr.il file and where it's located?