Well, your going to want to have IWT and click to move enabled.

To make meele automaticly run to your target, you are going to need to send keystrokes to all of them. When you click the IWT button, your slaves will run to where the target is where when you click the button, so you will need to spam this.

Im gonna take a guess that you use ISBoxer.

Make a action target grp with your DK's init. Name it meele or something.

Edit your DPS keys to send the target to the meele action target grp, and add interact with target button (I use F3 for this, and I use Alt + B for the hotkey in multiboxer. Use the ingame key for interaction with them, spam the button and they should run to it.)

Quickly written cause I'm in school.