Lol. All i do is say on ym destro locks for example. I open with immolate, conflagrate, choas bolt then shadow bolt times 5. This way no matter how fast i blow thru the cds by the time i get to conflagrate then 10 sec cd is done and then for chaos bolt the 12 secs is done. I dont even think about it i do the math at the beggining and add one or two more casts that have a cast time and no cd to make sure my cds are all up so i can use it again. So i have no worry about not casting nething due to cd not being up. So just add in more spells with cast time and no cd and just click mash away.