Hello,
i don't really know if this is the right section to post this but well if it's not feel free to move it.
If you connect to your PC a device named Nostromo N52 you can actually reduce the global cooldown of your spells to 0.Nostromo is a device that you can use instead of the keyboard and every ability you bind on 1 of it's keys no longer has Global CD.You can buy it from game stores or stores that sell electronic things.Here in greece it costs a maximum amount of 45,euro.
P.S: Tested on World of Warcraft and Lineage.