Well one it doesn't do .5 seconds it only does whole numbers. So it'll make that a 3 and two, If you don't wait the allotted time before doing your next skill it wont do the second action after wait. I.E. GCD is 2 seconds you do /ac"skill"' /wait 3 /ac"skill" But between the first action and second actions wait time you use another skill your second skill will never happen.