why don't you just make 5 macros on your healer that look like this: (I have 20 spaced over 4 toons)

/cast [target=toon1name] renew
/cast [target=toon1name, modifier:lalt] Flash Heal
/cast [target=toon1name, modifier:ctrl] Heal
/cast [target=toon1name, modifier:shift] Power Word Shield
/cast [target=toon1name, modifier:ralt] Power Word: Fortitude

Write this macro 5 times changing the name of the toon. assign it to keys like F5 F6 F7 F8 F9. Once you have that all set up if you hold the right alt button and push F7 F8 F9 you will cast fort on toon 3 4 5. if you hold down shift and push F5 then your first toon will get shielded If you just hit F5 F6 F7 F8 F9 then you will cast renew on every toon in your party.
this is helpfull in battle grounds that you end up in diferent groups, cause after a while you will know that jussa is F1 Jusab is F2 Jusac is F3 Jusad is F5 Jusae is F6. So when i'm running through WSG and a rogue attacks Jusac I hit my F3 key and he gets 4 renews (I run with 4 shadow priests and 1 Pally tank) If i hold Alt and hit F1 my tank gets 4 Flash heals.

Some problems you might run into when you first write the macro is that it may not work right when you try let's say alt. you might have something bounf to alt+F5 that won't let the key get passed right. What you need to do is go into the key bindings or bongos setting and set that key key yto something then un assign it. so that the key is free and crtl+f5 dosent make you target pet 5 or somthing silly like that.

You live and die by your macros so get creative and have fun.