If you want easy AoE threat, roll a Warrior. It's what I did.

What you are suggesting would allow you to use Fast blade -> riot blade as your combo for every GCD, and then in between you could hit Flash every time.

GCD1: Circle of Scorn, Spirits Within, Fast Blade, Flash
GCD2: Riot Blade, Flash
GCD3: Fast Blade, Flash
GCD4: Riot Blade, Flash
GCD5: Fast Blade, Flash
GCD6: Riot Blade, Flash
GCD7: Fast Blade, Flash
GCD8: Riot Blade, Flash
GCD9: Fast Blade, Flash

Does no one else see a problem with this?