Well i could do that, but when i first tried that. It felt somewhat restrictive, if i was to look aggro on a mob i'd have to target it and therefore that work be re-dotted and dps'ed.
also with using that, due to the lag of me changing target and the shammies actually seeing the target change on their game client from the main. this lag can sometimes cause the spell rotation do go out of sync i found.

An overveiw of time scales:
Macro one has 4.5 seconds to run it's duration.:
Flame Shock (1.5 sec GCD) + Fire Nova (1.5 sec GCD) + Chaining lightning (1.5 Sec GCD, 1.38 Sec Cast) = 4.5
Macro 2 with just 1.5, which is just Lava burst cast, My LB been a 1.38 second cast
>>>

Looking at the feature of /targetenemy
I found a post on some other long lost fourms regarding this
Quote:
I remember hearing that the semi-broken tabbing in WoW was Blizzard's solution to the "tab-dar" addons that put every selectable target in range on their mini-maps.

For me, I have to mash Tab twice to get it to cycle to the next target. I've kind of gotten used to it, but I often find myself mousing targets instead because it's often faster and more accurate when I tank.
Which looking on the dummies, at times the target doesn't change, other it does, i can't seem to see a pattern in what is causing it to not move to the next target but i can confirm it's clicking the /targetenemy macro and it not changing. but then out of combat it always works :S

Yeah i'll have to take a look at that addon. I really need to get some addons downloaded. Not even re-downloaded Jamba yet ... Shameful.