Leave the settings as is, where there is a default, and give community administrators the ability to change the security and screening settings of a post (without editing the content of the post). The thing is that 90% of the time, anyone making a post is going to leave the security and screening settings at the default, without changing them, so adding an extra, more complicated setup for communities when most of the time it won't be needed, doesn't seem worth it to me.
On the other hand, giving community administrators the ability to change the security levels of posts in the community (while still preventing them from changing the content of the post), would be more generally useful, not just for this case, but for other cases. For example, I recently made a one-off "gift" comm for a friend, where people made flocked posts before a certain date, and then the comm was revealed to the friend. I would have liked to have been able to un-flock the posts in the comm at the same time, but I didn't have the ability to.
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The thing is that 90% of the time, anyone making a post is going to leave the security and screening settings at the default, without changing them, so adding an extra, more complicated setup for communities when most of the time it won't be needed, doesn't seem worth it to me.
On the other hand, giving community administrators the ability to change the security levels of posts in the community (while still preventing them from changing the content of the post), would be more generally useful, not just for this case, but for other cases. For example, I recently made a one-off "gift" comm for a friend, where people made flocked posts before a certain date, and then the comm was revealed to the friend. I would have liked to have been able to un-flock the posts in the comm at the same time, but I didn't have the ability to.