Edit:

Let me try putting it this way. them off or attacking them will likely end with them doing exactly what you'd expect of xenophobe Romans inside their main castle. Controlling their actions aside from listening to their command is a no since they are still my characters. If I let you control main line npc's you don't know their history, what i intend for them, and may not act them in the way they should if I do spoil the aforementioned. If you want to have them just escort you to the throne room then they'll do that. However if you say no, or you want to question them I would need to respond.