hey, i have the same need, to boost an alt but haven't bought the party thingy yet.
here's what i do:
alt is warrior, main is hunter. i made a macro so that the pet will attack the alt's mob when it's HP is less than 100%(tagged)
/target altName
/script if (UnitHealth("targettarget")/UnitHealthMax("targettarget")<1) then PetAttack("targettarget") end;
/script if not IsCurrentAction(35) then UseAction(35) end;
the last row is so that it will start ranged attack, if sometime i follow the alt manually to maximize dps from hunter
Let's build on this and see what we can get out of it. so far completly afk with only pet attack it does about 150-200kills/hour at lvl 36, if i move the hunter manually and also use ranged attacks it goes up to 250+, if the mobs are packed.