I recently started with carbonite, and is and amazing add-on.
Now, I think that the quest givers tracking system could be improved. I guess that the actual system relies on a database of all the quests available currently on the game.
I don't know if it is possible to improve it by making carbonite query the server and show only the quests available to the character by lvl and requirement (pretty much like the blizzard system). So, if you lvled up or finished a quest, carbonite queries the server and shows if any new quests are available to your character.
It would be an amazing aid, and a more eficient system.