With option to separate by cooldown length and AOE

Can you describe this feature a bit more? What would it do?

Each AddIcon would add multiple icons: the first to cast, then the one to cast after that, etc. It was a feature that existed but never really worked. It would be specially useful if it would highlight differently the long and short CD, as it would allow to have only one script and the user could choose to skip the long/short CD.