Maybe use for Archivable too! Sometimes i don't want the users to download my whole folder at once , i want them to archive my subfolders only.
at the moment the solution is to
1. remove archivable from the main folder
2. select the subfolders, then add archivable
that means if you add a new subfolder later, you will have to set the archivable for it.
mars' suggestion is not what you are asking, but just something vaguely similar.