Why dont u just choose an attack spell instead of auto attack.. That way u can click and drag the attack spell icon from your list into the Macro... so it would be: (for zerker for example)
1.) /"Emote"
2.) /g "TEXT U SAY TO GROUP"
3.) /useability Taunt
which is the old way of doing it. U can now just click and drag the icon to the macro window... but was just using text cuz i dont have a nifty icon on hand to put in this response.
That way u can start your spells off right away instead of auto attacking with melee... Use a melee attack spell if u have one for your class, which will automatically put u into auto attack mode. If not, at least you will start attacking that NPC and u can just click on the melee attack button.