More detailled access structure in sub-galleries

It would be really helpful to be able to limit the access to main-galleries different to the included sub-galleries. I want to give access to the main-gallery to just two people from my clients company, but allow access to certain sub-galleries to all users with the link. This would be helpful because people with access to a sub-gallery can also access the main-gallery easily by shortening the URL accordingly, which ist not wanted from my side, as the stakeholder differ per project even the client stays the same.

It would also work to set a password for the main-gallery, but not for the sub-galleries, which is not possible at the moment.