So how do you transact too for example Azin when Xzin dies?
I been thinking about this myself for some time now. And what I figured out so far is that:

All extras have the following macro attached to a hotkey
/focus party1target

When first starting a game. I invite all my extras/none-main (what is a good word for them anyway?). Target myself and press the hotkey for the macro above.

So now all extras has focus on me.

Then after that extra's macro requiring a target would have [target=FocusTarget]

And if my main die, I could (whit my main) target the temporarily main/leader and re-hit the setfocus hotkey…

Haven’t tested this to the fullest yet, since it requires my main to die.

Is this somewhat how you do it? Any other ideas?