There is an in game Follow button, it is in the bottom left corner pop-up menu under Non-Combat Abilities.
I moved that to one of the secondary hot bar buttons (CTRL+=) and set that in ISBoxer.
Works like a charm.

I set up the variable key strokes for Target Slot 1, 2 etc to F1, F2 etc.
There is an assist command in game under targeting in keyboard commands, I set that to F12. From there it is easy to target and then assist or follow...no need for macros.