Off the top of my head I do not think read tracking is an inheritable function, such as rate, like, or comment.
90% sure it is an implementation detail for discussions.
It you want it for your content type you will end to program it I'm afraid, but I'll try to do some research to confirm.
Did you get any chance to have a look into this? I understand you might be busy with other stuff around.
Please have sometime on this.