Yer setup would work great.

Been running pali/druid/shaman fairly good group at aoeing

pali spams consecrate has Retribution Aura,Blessing of Sanctuary and from the druid he gets Mark of the Wild and Thorns. Once things start start hitting the pali its staying on the pali

shaman drops Stoneskin Totem ( when yeh got 5+ mobs one yer pali it helps allot) and Searing Totem cast CL when ever its up and off heals.

druid primary healer auto attacks the pali target when not doing anything or goes all out dps if not much healing is required in cat form.

If I where to make a group only meant for aoe farming I'd probaly go with
2 X palis for 2X consecrate, kings, Blessing of Sanctuary, Retribution Aura, Devotion Aura
3 X warlock one with improved imp then it would be a toss up whether to use Seed of Corruption and/or hellfire( would depends on what kinda gear i could get em)
If the pali can hold aggro while the warlocks are burning in hellfire yeh could spec em for felguard