Weakaura attaching to a Spell instead of a Button?

[rakkarage]

When I make a weak aura I sometimes have to tell it which button is 'Rampage' so I can make it glow.
But is there some way to attach to the Rampage button instead of ActionButton1? So that if I move my button or send the weakaura to someone else who has that spell in a different location it will still work?

I noticed that when I mouse over Rampage in spell book it highlights it on bar. So it knows where it is? How can I access that knowledge and attach to generic action button instead of specific button?

Thanks