Seeking advice on a single button for dps/hold shiftbutton+same key = all cast heal on that target.

[Maxion]

When you change your target it'll take a second or so for your alts to know you changed it.

Easiest way to easily be able to heal each toon in your team is to set up separate buttons that heal targets by name, with one button for each one you want to heal, though this is more useful for having a dedicated healer.