Ideally, my perfect rotation helper would contain something like this:
(see attachment)
- Clickable/bindable buttons.
They would contain the key spells used in the rotation, ordered by importancy or by priority. They would have a cooldown like a normal ActionButton on top of it.
- Duration timer.
This could be on top of it (like in the image below) or below it.
- Arrow or some other indicator.
Something like a pulsing glow on top of the button, to indicate that you should use that ability next. An arrow is used in the below image.
So basically, something like SpellFlash, however SpellFlash is not an AddOn I would consider to be capable of helping you with rotations, but an AddOn to remind you of things you can do when you get an opportunity (I'm thinking of reactive abilities like overpower)