NOT play an animatrion when you use an ability?

Well, with the last patch, there's a field in the ability editor that allows you to specify which animation to play when you cast Ability X. Is there anyway to prevent it from playing the animation?

Specifically, i need to have locust swarm cast without the "alternate" animation being played while it's active. Setting the "Required Animations" to something results in that animation being played for an instant, and setting it to looping results in it not being played at all.

I've tried that, what it does is make it do the stand animation, THEN play the alternate animation for the duraton of the spell.