Okay, I'm just gonna give you the "whats what" on this spec considering i have run it many times and several variations of it.
For 2's with a rogue you should try
this You will have tons of burst, a little bit of survivability, and very little outlasting potential (so rogue is a good choice)
You should be scorch spamming for standard damage, and than kiting and if a target ends up frozen/you freeze them than shatter combo and continue scorching.
Blast wave is basically a last resort kiting/finishing burst move due to the chunk of mana it will remove.
And last but not least HAVE FUN!! its a very very fun spec.