I use a combo a lazymacro for my mages and a step bar...what i mean by step bar is i have a macro 1-6 buttons (i keep stuff i want to control individually on 7-12) So i have two steps, at least. 1st step hits one of the buttons on my main bar, second spams one or multi abilities placed on my "step bar". My step bar is shift 1-12, and depending on the class i might have several abilities being spammed on step two.

I tested my arcane missle procs and found that i did the most dps this way, over just using the lazymacro. The macro has missles in it and so does the step bar. Im sure i am not getting it perfect, but my mage(s) are always in the top 5 or so on world bosses. ( they are maxed in Tanan gear, no raid gear at all )