When you mouse click on the little round 'cycling index' (as maya calls it), you can access both the radius and translation of the area of effect.
With maya 7, by default you can resize the radius using the hotkey 'b'. However the translation of the area of effect is still done manually as far as I can tell.
I'd like to be able to assign a tiny script to a hotkey that would automate the activation of the cycling index (ie. clicking on that tiny round icon).