It's a neat idea but voice will never compare to the speed of pressing a key instead, in PVE it could work out nicely. The other down side is when you press a key it understands and perform that action. Voice on the other hand "heal", "Heeealll" "HEEEAALLLLL" you die. Then after you rez, you wife comes in pissed that you woke her up, she tells you to go die and in a fire, your locks then cast hellfire and kill themselves, worst yet your sleeping on the couch tonight.