the ability to delete only content.
see when you go to manage tab on your website within the peoples section of your website or accounts app within studio you have a option to select a user account & Delete the account or delete with content i think a option to just delete content would be great aswell as some people will just want to or need to mass delete a users content only if the user breaks any rules as some websites have a strikes policy and wouldn't want to delete seid account straight away.