Greetings , let me preface this by saying three things:
One: i do not know how to play a rouge
Two: until we know what Macro / or section of macro you are referring to , the odds are you will only get generalized information.
Three: I am not ,nor do i claim to be very knowledgeable about GS , but i try to share what i do know , I do hope this helps you fix your issue.
those things being said ,. from the way i under stand slice and dice , is its a finishing move that consumes combo points and the number of points it consumes affects how long it is active for ?
two things come to mind on how to limit it , take it out of the rotation and put it on a mod. or some sort of cast sequence and by that i mean something like :
"/castsequence ability 1, Ability 2, Ability b, ability c, Slice and Dice",
and the mod could possibly go something like
"/cast [mod:alt] Slice and Dice",
if you do the mod , it would be as simple as keeping an eye on your combo points and when you want it to go off , just hit the mod and it should kick in.
with the Cast sequence, i don’t think you would have that good of control on it , but by making the ability’s that come before it in a cast sequence be the ones that build up the combo points that you want it to cast on , then that might give you them time frame you are looking for ,since the ability cant be cast till the points are there .