I just use Zanthor's Quest Broadcaster mod made by one of our own multiboxers here then I have the following inserted at the begining of a couple of macros for one of my mage minions since they take off half a second after my main then I bomb from there and everyone gets credit. Works like a charm...

Macro insert for Dead Scar
/use [mounted] Arcane Charges
/stopmacro [mounted]

Macro Insert for Reinforcements
/use [mounted] Flaming Oil
/stopmacro [mounted]

Note all my macros use the red question mark as the icon and start with #showtooltip so the icon changes appropriately to what the macro does based on your current conditions....