Isn't there some new functionality in 3.1 that will allow you to interact with targets via macros? I have seen a guide on how to loot from your main toon for all of your slaves, and it seems like something simillar could be instituted to get the quest dialogs opened.

edit: here is the thread that I am referring to: PTR 3.1 Interact UI Changes - How To Use Keyclone to tell Slaves to Loot From Your Main