Ditto, would like the same answer!
actions+=/run_action_list,name=aoe,if=active_enemies>=6
actions.aoe=rain_of_fire,if=remains<=tick_time
actions.aoe+=/havoc,target=2
actions.aoe+=/shadowburn,if=buff.havoc.remains
actions.aoe+=/chaos_bolt,if=buff.havoc.remains>cast_time&buff.havoc.stack>=3
actions.aoe+=/cataclysm
actions.aoe+=/fire_and_brimstone,if=buff.fire_and_brimstone.down
actions.aoe+=/immolate,if=buff.fire_and_brimstone.up&!dot.immolate.ticking
actions.aoe+=/conflagrate,if=buff.fire_and_brimstone.up&charges=2
actions.aoe+=/immolate,if=buff.fire_and_brimstone.up&dot.immolate.remains<=(dot.immolate.duration*0.3)
actions.aoe+=/chaos_bolt,if=talent.charred_remains.enabled&buff.fire_and_brimstone.up&burning_ember>=2.5
actions.aoe+=/incinerate
there is your answer, RoF even though it doesnt generate embers is still viable in doing damage, especially on AoE since it benefits from immolate +50% damage. Also Demonic casts RoF when you move which is better than doing nothing. Ony situation where RoF is bad it is on single target. Even if you use Mannoroth's fury RoF is viable on 2 targets.