How I play it is as follows:
Throw out one or two Living Lightnings then hold down right click for Sleet Storm while holding down (I forgot actual name of the button thing) whatever button you have set to keep your character stationary. Then hit 1 and 2 for DS and FN when monsters get close. Left click for Living Lightning when needed to get Critical Mass to do its thing and get the cool downs on DS and FN to reset.
So far I totally dig it. Might not be the best build out there but its fun so far!
Any constructive criticism would be helpful!