Allow moderators to delete each others messages
Moderators sometimes manage game lobby links or somilar for their streamers. As such the links may get copied to the clipboard easily. If there are procedures in place to greet users or similar, then it might happen that moderators accidentally post sensitive information into the chat.
Also, a rogue moderator may abuse their rights or post unwelcome messages.
Thus, moderators should have the option to delete their own and other moderators' messages.