Ok, I haven't got it working yet. Here's what I've done:

* I created the "Straight Key Broadcast plus Click" Mapped Key on the tank Key Map (I drive the tank)
* I said to send a "W" to the Character that will be casting Healing Rain
* I bound "W" to Healing Rain on my resto shaman
* On "Next Click w/ Video FX -> 'shaman'" I set Target to "Character:'shaman' and checked "Use Video FX during this Send Next Click"

I didn't check any of the other choices, i.e. "Video source size," "Video output size," etc.
I *did* bind "W+Click" on the tank Key Map to "Hotkey: G10-G15"

Yet, nothing happens when I press G15. Any ideas? Is the problem that I didn't tell it the size? And if so (under Video source size,) that looks like a scalar value. Wouldn't I need a height and width?