What if :

Scatter was back to a short cast and came with a new trait forcing the next Dualcast to be AoE versions, essentially "upgrading" VerThunder to VerThunder II and VerAero to VerAero II after Scatter, and tweak the mana and potencies around.
Then return Impact to an upgrade to Jolt II under the effect of the old Impactful. (I will yell about that until 6.0, my apologies in advance)

The CD reduction on Contre de Sixte after an Enchanted Moulinet would be nice too...

Yet I'm wondering why they mentioned RDM specifically in the latest LL actually. It's on the lower side yes, but it's not as low as it was before 5.1. And I kind of think MCH/DNC/BRD are in a more "vulnerable" spot currently...