The feature that allows admins/teachers to generate icons that identify contributors and their type of contributions as used here should be available as part of core. I have not run across this as a plugin or a block, but I would think it is, which means it could be made available. I suggest this as an improvement rather than a New Feature, as it is already in use in Moodle forums. Is therre any reason it cannot be added in future versions? Or be a downloadable block?