Hovercast possible?

[kiersten]

Is it possible to make it so that hovering over a UI element and clicking a spell would cast the spell on that target? Without actually selecting the target in the UI element?

IE.. I'm healing my group and have the main tank targeted. The assassin in my group gets hit and needs a quick heal. I hover my mouse over him, hit my heal key, and go back to healing the main tank. My target window wouldn't switch targets.