Not sure I follow. Folks are not required to configure anything. If this change is accepted for instance for a CAS4 release, the proper overlay structure would have everything an adopter would need to get started. There's nothing missing in the config provided in this pull that would then be required of the adopter to do, other than making sure the overlay is in sync with the version used. Given the release strategy, I suppose that double checking an overlay config to that extent would be in order. 

Isn't that true?