Hey i've been leeching these forums for too long and finally discovered something worth posting that ive never seen or heard of before.
This only benifits casters and can be slightly confusing to understand.
Ok so as an engineer you have a glove enchant called 'Hyperspeed Accelerators' which when used grants 340 haste for 12 secs on use.
Now the bug is that when used with an instant cast (macro'd) at the end of a cast it will reset the global cooldown and you can use another ability at the same time. It sounds confusing so ill use an example.
I cast mind blast, and right at the end of the cast i spam a macro that uses my accelerators and devouring plague at the same time, devouring plague goes up and the global cd resets (instantly not 1.5sec later), i then cast shadow word: pain (which is applied at the same time as devouring plague). Basically you get a free global cooldown.
so on a timeline
0.0_start casting mind blast
1.1_mind blast hits
____accelorators+devouring plague cast
____shadow word: pain cast
2.6_insert next cast here
I can only assume it works with any other caster class but i cant see why it wouldnt work.
Yeah its only a gcd but any raider will tell you that every small thing counts and its especially helpfull on spriest openers.
*Video Update*
[ame="http://www.youtube.com/watch?v=pitEnCbz_dI"]YouTube- Hyperspeed Accelerators Bug[/ame]