With ISBoxer yes, you can target a specific ATG (action target group).

In my setup I have ATGs for:

Stuns
Incaps
Grips (retail)
Interrupts
Taunts

Then I have the designated ATG as the target with round robin selected.

I also have a stagger /focus command that I flip with the mouse wheel to quickly focus 3 or more mobs in a pack I want to CC.

Then I have these hotkeys:

TARGET TAUNT
FOCUS TAUNT
TARGET INTERRUPT
FOCUS INTERRUPT
TARGET INCAP
FOCUS INCAP
TARGET GRIP
FOCUS GRIP
TARGET PURGE
FOCUS PURGE

The above keys are round robin selects.

STUN FOCUS ALL
INCAP FOCUS ALL
PURGE FOCUS ALL

The name on those is as implies. The command is fired off on all of them and because focus can be different targets it's a great way to lock down an entire pack. So those dangerous packs like in Mechagon become very manageable.