managing a group

mlines

I'd like to get suggested citations from members of a group, verify and correct them, then make them available to the group again. To do so I need sub-collection that any member can upload to but not delete from, and another that any member can download from.

This level of permissions detail does not seem to be available - any workarounds?

Also, are there any ways that defining how syncing works that would do this?

Thanks in advance for any suggestions...