You can set up any number of attack options.

Target your focus, IWT that target and DPS your focus.
FTL Assist the main window, IWT that target, and DPS that target.
Target by arena frame, IWT that target, and DPS that target.

Lots of possibilities...
And not really all that hard to set them up.
Not sure how practical it would be in all situations, but easy enough to experiment or switch between methods.