target=mouseover

You can't click it though, you need to use a hotkey for it to work. You need to use it with the healer, can't do target=party1mouseover for example.

I used 3 macros for every charachter and pet once. A renew, heal, and power word: shield for everyone. I was using bartender to put action bars in the middle of my screen for easy clicking.

Both of these need to have the healer as the main, and unfortunately it sounds like you don't.

Depending on how many keys you have, you could put one key for each character, and use one/two more for modifiers to get different heals on each. With 7 keys you can get renew, heal, and shield to any party member, self included.