I've got two different IWT mapped keys.

One is imbedded into my DPS spam, but is only sent to the melee characters.
I can toggle this on and off, meaning the spam will IWT or won't IWT.
Even if its on, I can press a DPS key once... let my toons move to the mob/enemy, and then spam without causing run-offs and while leaving IWT on.
http://www.dual-boxing.com/threads/3...469#post312469

I have a different IWT, that goes to all characters.
It executes a step on both press and release.
On Press, all it does is FTL Assist.
On Release, all it does is IWT to all windows.
I can press and hold for a small fraction of a second, which ensures everyone properly assists if in a lag environment, and then release for the IWT.