If you do the hunter's Auto -> Steady -> Auto -> Steady, then you could just have that macroed as a sequence.

There's a macro for this somewhere in WoW's Hunter Forum that you can use. Definitely wouldn't have multi-shot weaved in there.

I would have the Druid as the main because of healing.

Button1 would lay down totems in a macro sequence also
Button2 would do Hunter's Mark and send both Lock and Hunter's pets in
Button3 would do the Hunter's macro sequence, lock's sequence, shammy's sequence, and the mage's sequence (all basic dps sequence macros) This one would be spammed.