Add-on Thread Moderation

I am currently using spam protection to force threads containing links to be moderated and it works good except it also makes signatures and conversations containing links or images to be moderated. But since they can't be moderated all my users are just receiving an error message.

So I'm not sure if an add-on already exists for this but I need an add-on that checks New threads and posts for external links or images and if the thread or post contains either one then it gets put into the moderation queue.

Thank you