Adding an option to the HUD to create categories would be a useful function (f it doesn't exist already). As I work with the support team and reception I often have to transfer calls between colleagues, so the ability to create a category to quickly locate a team then a colleague would save some time. Having a header in bold such as 'Support' or 'Sales' then being able to drag and drop people in at one they've been added to the HUD. Just a thought.
I know you can relocate them by clicking and dragging them in the edit function when in the HUD but to separate between teams would be useful.