Custom Groups - Add a 'Select All/Deselect All'

Hi Navarre, Just wondering if you could add a 'Select All/Deselect All'' option at the top of the checkbox columns within the custom groups section. I have two category columns and about 800 codes that I need to categorize but only about 20 of them need to go in the second column. Also, it would help if anyone decides to change how they categorize each code. Just thought it would be an easy and helpful function to add. Regards Darryn