In the spirit of putting power in the hands of the user (e.g. the filters system) I propose a single extra field on the
profile page titled: Custom footer.
Some might like to have all [marked-for-deletion ] tags collected, copied and displayed under the bones as red links to the mentions... possible.
Some might like to implement a feature to hide annotations by users they don't like... possible.
Some might like to scan an annotation for [+] or [-] and colour it green or red appropriately... possible.
Some might like an annotation bank, where they can pick a preprepared annotation from a dropdown below the annotation box, and have it fill itself in... possible.
Some might want a search function underneath the category list to help find the right category... possible.
The key here is that all these things can be added by users without having to bother the site admin or change the experience for anyone else.