What I've been doing lately on my rogue is making my rogue join/leave action groups for this... I've got an action group for hunger for blood and another for mutilate/eviscerate castsequences.... I press a key and the rogue leaves one, joins the other, and when I let go of the key, it switches back... it's like a modifier for one toon since I keep spamming G17 and everyone else keeps doing their thing.