How did Rome lock herself in her room?

In fact, why do the Vuduri even have doors? In the original long-form version of Rome's Revolution, I mentioned that the Vuduri didn't even sleep. However in an earlier post, I explained that this made Rome too weird so I let them sleep at night.

This made having doors a reasonable proposition. Rei and Rome discussed this as they embarked on their voyage from Deucado to Earth in Part 3 of Rome's Revolution. Rome told Rei that outside doors were needed just to keep the elements out. After all, it did still rain and occasionally snow on Earth, even in the 35th century.

Inside doors are a little harder to explain since the Vuduri have no modesty. However, now that I had them requiring sleep, they still need relative quiet, even though they are a quiet people to begin with. So I gave their apartments doors for quiet, not privacy. But as we saw in the first part, the doors could be opened manually as well as by OMCOM. So how was it when Rome was first Cesdiud, she was able to lock herself in her room? Originally, I just said she wanted it that way. I allowed OMCOM to respect her privacy. But Bruce challenged me on it and said why wouldn't OMCOM just open the door when given a direct order by Ursay? Here is the final exchange:

     “OMCOM,” Rei said softly. “How come you couldn’t open Rome’s door when Ursay wanted you to? How come you were able to lock me in my room?”
     “Rome is different. I treat her differently.”
     “Why?”
     “She is…she is the closest thing I will ever have to a mother. I was being considerate.”
     “What do you mean considerate?” Rei asked. “They’re in trouble here. Ursay needed her. Why couldn’t you just open her door?”
     “Did I mention that she inserted a locking pin which prevented that?”
     “No.” Thinking back to the expression on Ursay’s face, Rei laughed to himself even though this seemed to be rather serious.

So the pin was Bruce's idea and I give him full credit for it. It creates a valid solution to a problem that nobody would ever notice.

P.S. I got a nice shout-out from Graeme Brown's Worlds of the Imagination. Thanks, Graeme.