I still think force lightning should be a part of lightning. I haven't figured out why it's not. I mean it is the only one that actually even has lightning in the name, and is the original lightning power. Any thoughts?
You'd need one heck of a revision to madness mechanics, and lightning damage would probably come to be rather OP. 1,5 sec cast LS is simply vastly inferior to it, even for the probable lightning storm proc.
So force lightning, with thundering blast on cooldown, and affliction refreshment every now and then.
There might be a way to do it, but imo other things needs to be looked at first.