This was just one of my idea from early this season to fix warrior opness but newayz...
Pummel and disrupting shout... Some type of shared cd would solve the problem imo.
My idea is to make it so that you can disrupting shout -> pummel but you can't pummel -> disrupting shout since disrupting shout is on a longer cd.
This way if you juke the disrutpting shout (45 sec cd) and the pummel (20 sec cd) then you are safe from interrupt for at least next 20 sec and also you don't need to worry about disrupting shout for next 45 sec.
I really don't mind taking piercing howl over disrupting shout but then disrupting shout becomes another useless talent in our talent tree that no one will bother taking. I'm sure it's not Blizzard's intention to create as many useless talent as possible that no one even considers as an option.
Thanks in advance~