There are lots of ideas here about various things which could but probably shouldn't be added to the Halfbakery. Many of these involve Javascript, fancy formatting or silly tools.
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.
This Custom footer would be output last as part of every single page view made by that user. Users could use the custom footer line to put in handy links that they like, or even embed a javascript application (<script src= "http://www.otherserver.foo /script.js" />).
It is the latter use which is of interest to this idea - a linked javascript file has access to the DOM of the Halfbakery page, so someone who wants to add new tools for themselves can do so entirely client-side.
For example:
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.