I've been using Imagevue X2 for a bit less than two days and already like it a lot. But as I think about it, it seems to me to have a built-in limitation which is that it's one gallery, and the different groups of images reside in folders in that one gallery. Therefore there are only two levels, (1) the gallery of all the folders and (2) an individual folder. Either you allow viewers to reach all the folders (by displaying the menu that gives access to them) or you remove that menu and restrict viewers to one the folder of images to which a particular URL takes them (which I've done). That choice is made for the whole gallery.
I can see wanting to give access to different groups of folders to different people, which could be done with some kind of a multiple-level organization of image folders. Has this subject come up before? Of course I don't understand everything about this software yet and maybe there's some way to accomplish this.