I tried to do a macro
/cast [Target=Focus] Banish

And manually set my focus per toon based on what I want them to cc in the trash pack. This did not work with FTL because once I do anything with the main and press my dps button the toons will not cast at their focus. Instead they cast at whatever my main is targeting. It's really a pain in the ass.

My work around is changing the macro from above to /tar mobs name then /cast banish at the end. I just manually add in all the trash mobs names as I do instances. Once the names are in then all I have to do is mash my button and if the mob exist it will target them and cast the cc. It's not 100% because many of the mobs have the same name so I can hex and sheep the same target.

The holy grail for me is figuring out how to cc and set different focus for my guys other than what my tank is on while using FTL. If I figure out Isboxer better maybe I will find the grail. Until then I am still fighting with it.