He's also had
But as of hitting level 75, Kuan has gotten Lava Burst (which by the way has the lamest entry in Wowwiki ever as of this writing, perhaps I will take the time to fix). So I spent last night moving buttons around, and trying out different arrangements. And the above button placements do not make any sense any more, so after some fussing, I ended up with these.
Playing in Violet Hold (which struck me as super easy), and also against Arugal, what I finally settled on was not quite a cast sequence, but an opening fight sequence and the rest is as-cooldowns-dictate. If pulling (i.e. outdoor questing), open with Lightning Bolt, then Flame Shock, Lava Burst, Lightning (Chain if CC isn't an issue), Lightning Bolt, Lightning (Chain if CC isn't an issue), repeat since Lava Burst unless CDs run out, then Flame Shock again. I didn't really see many things last that long. that didn't work so well on Arugal becuase of some immunity mechanic I have not researched.
However that niggled in the back of my head, so I went to the Elitist Jerks forums and looked at what they had to say. And after a lot of debate on how to fit 3 casts with 8 second cooldowns in a 16.5 second window and what haste would make it possible, the conclusion of the thread I was readying was screw sequences, just remember spell priorities (Flame shock > Lava Burst > Chain Lightning > Lightning Bolt) and try to keep as much as could be on cooldown (or dot ticks). If more than 6 seconds left on Flame Shock and you were moving (so instant casts only), cast Earth Shock.
Meanwhile, Earth Shock isn't 4 anymore, it's reversed spots with Flame Shock. And Frost Shock is 6 instead of Heal. I'll be hitting the wrong buttons for a while, I can tell.
EDIT (the next day): turns out I was misremembering about the heal keys. I found a screenshot of a Hakkar raid from Oct 2006 (yes, that's about how far I've gotten uploading the screenshots):