I used to have an 'Action Target Group', which is just a predefined group.
You drag characters into the group or out of the group, at least initially.

There is a mapped key action to add characters to an Action Target Group.
And there is a mapped key action to remove characters from an ATG.

My spam key would enable click to move (press) and sent the IWT mapped key to the 'Melee' action target group.
And then releasing the key would disable the click to move.

Then I just had a toggle key.
Press adds characters to the group.
Press again removes characters from the group.
So I could easily toggle if I wanted my spam key (without changing the key I was spamming) to have my melee IWT or not.

I'm not sure if IS Boxer is exactly the same anymore... but this should give an idea on my setup: http://www.dual-boxing.com/threads/3...469#post312469