How to handle Arcane Missile procs?

[Ughmahedhurtz]

Unfortunately you cannot write an efficient macro, or ISBoxer Mapped Key, to cast arcane missiles when you have the right amount of stacks. You have to just have to hope that you can get something working that is close enough.

+1. Any of the binary proc-based abilities are not "scannable" since, oh, about WoW 2.0 or something. Meaning, you have to just work in the proc as a part of a fall-through/multi-step macro set (where it will always TRY to fire but won't block other spells if it fails) and hope for the best. Paladin Holy Power is another good example of this, as it's unpredictable (within reason) and either wastes resources or blocks macros if you put it in the wrong place. This is where the "art" of multiboxing starts to apply with experience. Sadly, if we (and by proxy, raiders) did have a "fool-proof" method of utilizing procs, you can bet your ass Blizzard would nerf it Into. The. Ground.

Looking at arcane blast/charges/missiles on bnet shows that every blast builds one charge, and arcane missiles maxes out at three. That's not exactly "random" and should be pretty easy to macro up.