If you allow comments globally (in system settings), you still need to enable comments in each item separately. But ok, maybe I can add new option for each addon that enable comments for all items.
But for this moment its really painful, when user adding photo and it's going to approval process, on approval process i don't see this option. I need approve photo, then again go to album and mark this checkbox for comments for every photo.
Maybe for temporary workaround there will be chance to hardcode this checkbox to be always mark on submit process?