I tried IWT for fun on a pally team, and set it up in two steps in ISboxer, with the box ticked in ISBoxer to both register push and release.

Step 1: IWT
Step 2: Attack

I just spam that one button for melee attack.

the disadvantage for me with this setup is, I don't want my toons to keep running about in some stationary fights, so I might have to key in a "normal" attack button without IWT so my toons will stand still while attacking.
Anyway, I haven't played the Pallys much, just wanted to tryout the concept.