Roshard
I tested both ways and OP does kind of indirectly address this in the FAQ section. Synergy between Scepters and Arcane Severance means they overtake Eye of Reen mainhand. As far as I can tell, I get zero procs once I moved Reen to my offhand, invalidating it as a choice there.
Wootles
I've been running Sunwreath for a week and I'm just not convinced. Two of its effects are on Ignite chance and DoT, things we aren't working in this build. So then all we really get is shape change, range reduction, mana cost.
Making the positive benefit the shape change - maybe? I just don't feel like I ever had a situation where the cone wasn't good. And the reduced range... just painful.