I didn't find this in other topis...
I suppose it will be good to add new option: permission for comment pictures for Gues group. I know, this is in groups panel, but when Admin agree for comment for this group, the decision abot moderate of not moderate comments is general for every posts. Mayby it's better to add option "guests comments moderate/non moderate"? For registered users it will be easier to use gallery, for gallery it can be more safety and comfortable to use this option in time, a part of anonymous is not fine.