I use a combination of /Console AutoInteract 1 (on slaves only) /Console AutoInteract 0 on the current master and a modification of the 2 step method.

Instead of having a Button1, Button 2 round robin as used typically by the 2 step method, I have a 5 step method setup for my melee groups.

1. Press IWT key on all but current.
2. Press Step 1 button
3. Press Step 2 button
4. Press Step 1 button
5. Press Step 2 button

This eliminates some of the "random squirrelliness" of spamming IWT - at least for me.