If you have real actual castbars on any of the background clients you can display them anywhere you want on your main foreground client via ISboxer's VFX functions.

I do that for many things including Sweeping Strikes (SS) on my background Warriors so I can see exactly what stance they are in, when SS is actually off cooldown, and whether they have the rage available to actually pop them...

If you do that I would also setup a hot key to quickly turn on/off VFX displays as I often toggle them on/off when doing maintenance on the given client.