I have recently came across an article describing (yet) another possible way to (ab)use AP (which you can find here).
Basically, it revolves around this macro:
/castglyph Arcane Power major3
/cast Arcane Power
In the situation where the AP glyph is already equipped in the lower-right corner, the macro removes the glyph, but still casts a 30s AP with 90s cooldown, like this.
I suspect this is heavily contingent upon environmental factors; the original author said this has a high chance of failure in raids (or places with many people), and while I can get it to work in Ironforge (and Darnassus), I couldn't in Stormwind.
I don't raid (anymore), so I'm not sure about the efficacy of this, besides from the obvious benefits on Fel Lord (which is the example he used in his video). I'm very curious as to everyone's thoughts on it.
PS: cgll's method is persistently successful, although it probably can be smoother:
this one works for me even in 30ppl raid,
just rightclick the glyph for the popup "are you sure you want to remove glyph of arcane power ..."
you can close the glyph window after and just use the following macro before pull
if you double click the following macro u will get 30 second ap on pull and another 30 seconds after 90 seconds like isaac mentionedCode: Select all
/click StaticPopup1Button1 /use arcane power
Code: Select all
/click StaticPopup1Button1 /use arcane power /castglyph Arcane Power major3