Well, with Keyclone, you are limited to straight key broadcasting.
So you will want IWT keybound to something in easy reach (I'd probably go a mouse thumb button, if your mouse has thumb buttons), and also have a /Follow macro within easy reach.
You can assign two hotkeys for each action, so maybe one general IWT key for everyone, and another IWT key bound only for your melee toons, which you can spam on the mouse.

That way, your melee team can spam the /Click macro, or whatever you use for DPS on say '1'.
And you can spam, as required, with your mouse.
And when the target dies, have your /follow ready to go instantly, to catch your toons before they run off.