From the coding side of things you don't need to make any changes. The Use ability can be used when the character is in the air. When you create your new magic item you will need to make sure you setup the correct transitions within the animator controller so there's a transition when in the air. Take a look at this page for more details on the animator:
New Animator Controller The animator controller included works well for the included demo scene but may not be the best setup for your particular game. . . .