Hm something that came to my attention was a GC post recently - I'm not sure if they're talking about this hack or something else:
We had to change the ability queue system you are describing to fix an exploit that was threatening to become pretty widespread. It is unfortunately one of those cases where a few bad apples ruin things for everyone.
We are working on an improvement where the most recent command will override the previous one. If for example you are spamming Hamstring, and then succeed in snaring someone, you can switch to Mortal Strike which will clear out the Hamstring queue instead of wasting more GCDs on Hamstring.
Source: World of Warcraft: Cataclysm Beta - (English) Forums -> New ability queue system needs work
I was just about to post about this. It sounds like they can't find out who is using the GCD hack still, but they are trying to take measures to prevent the GCD hack from being effective. How the hack turns out when 4.0.1 hits live is yet to be seen anyways. The MPQ hack will no longer work; I looked at the Spell.dbc from PTRs and theres nothing at all resembling GCD-like values.
hows this going with 4.0?
Worked! on a pserver atleast, Was spamming Ice Lance like no ones business but mine!
EVERY TIME something good happens, something bad equal to the good will accour
a example is when they fix the GOD DAMN EXPLOITS >_< why couldn't they just suck at patching then we'd all have more fun