[OogieBoogie]

Well it's not any different than WoW when you have multiple WoW accounts attached to a single battle.net account. I've been botting like that for YEARS with no problems. I don't think it would be any more difficult than most of the programming they've done so far. I just click "Data Center" and select my realm and then it asks me to choose my service account and then I log into my character. There's literally like a 1-2 step difference than the current login procedure.

edit: I'm not saying that programming is easy but I'm just saying you wouldn't have to completely rewrite the entire login process.