depending on the quest you can open with your main and take the quests then run this macro

/script AcceptGroup();
/script AcceptQuest();
/script AcceptTrade();
/script RetrieveCorpse();
/script RepopMe();
/script ConfirmAcceptQuest();
/script StaticPopup_Hide("PARTY_INVITE");
/script StaticPopup_Hide("QUEST_ACCEPT");


on all slaves and they accept anything thrown at them.

you cant hand in quests like that though