Altered Time - your #1 World of Warcraft Mage resource!

First time poster. Big Frost fan but, I'm no theorycrafter. With the way Brain Freeze procs work (if I'm getting it right) i.e. they proc when Frostbolt lands (?), Is it worth using a /stopcasting macro on Brain Freeze to avoid proc munching? Thinking, in particular of Mirrors of Torment and how muc...