Let's post our suggestions for new API functions to use in CCs.
Some suggestions for pets:
GetHappiness() for feeding
PetAttackTarget(ulong GUID) for attacking other targets than the one the player is fighting, for pulling more mobs or to make the pet attack mobs targeting you
PetUseAbility(string SpellName) for micro-management of the pet

Also I'd suggest something like:
LanchSpell(Spell Spell, ulong GUID) for easier pulling and/or Crowd Control.

For NpcInfo and TargetInfo adding information about mana would be good too, like MaxMana, ManaPercent and Mana, for using abilities like Mana Burn or Viper Sting.

Got any more suggestions? Post them!