Currently with the user group plugin you can select a user group to be able to manage a top level album. If I want a specific sub album to be manageable but not the top level or its sibling albums, this is not currently given as an option. From the zp_albums and zp_admintoalbum tables it seems like this could happen. I made an entry into the zp_admintoalbum table for a usergroup to a subalbum. In doing so the groups tab will show the parent/child in the managed albums list(not intended so it doesn't have a proper tree structure stemming from its parent album), but upload and album tabs for that user group will not pull it. I imagine this is probably because the rights are checked on a top parent album level only. Going into the sub albums to determine the lists for upload and album management would be great.