I had this idea after I decided to pretty much organize my contact list
The arrow expands to a list downwards with all the contacts in the group/category (their names and customizable to their PSM) and their status icon
And (it further develop the idea) If say 1/10 contacts have their status on online and the other 9 are offline the icon is almost grey with just a bit of green. If 9/10 have their status online and just 1 is offline the icon is almost green (or regular online status icon) with just a bit of grey. This also goes for away and busy. Its a pretty good design idea but with just a simple group/category on desktop it would be good.
OT: The font on contact on desktop can't be customized? I could have sworn it could.