You basically just need a button to park your shaman - i.e. break follow; e.g. back arrow (I have it mapped to the 4th mouse button).

setup - pally is the focus and driver. (shamans follow pally)

This is what I do
1) walk to about 20 yard from a group of stuff you want to kill
2) park your shamans (i.e. stop you shamans from following your paladin)
3) put down your totems as you move your paladin forward
4) attack the monsters with your paladin - I generally use normal mouse clicks for attacks (consecration, judge etc...)
5) once you get a bit of aggro with the pally, spam your lightning bolt/CL with a key (I use the "f" and "r" keys for LB and CL.
you should be attacking whatever your pally has targeted.
6) loot the corpses
7) drink because your pally is probably out of mana

You can also set on of the shamans to heal by using the macro /cast [target=focustargettarget] chain heal
substitute this for the main lightning bolt key on one of the shamans. This will heal whatever your pallies target is attacking - which is usually who needs the heal.