I had thought about this John, however, had a concern. I had our holiday layout set up this way, and things would come on without using remote. Sometimes when we were in bed. Therefore, we would unplug everything if we were leaving the house.
I don't see that as a significant problem with these. The remotes are slaved to the transmitter by a unique code for each receiver, kinda' like Ethernet boards. No two remotes have the same code. So, I just cleared the transmitter of any previous codes and then paired them according to my desires. Not knowing what make/model of remote control you used, I can't comment on it's security. I know I have seen these systems that were a lot more flaky, that was one of the things I looked at when evaluating my choice.
Of course, in the rare instance that something could trigger the layout power, it would first have to trigger the master and then separately one of the transformer remotes as well. The individual track power remotes are all powered only when the master remote has turned on layout power.
Also, in that extremely rare instance, I have faith that turning on my layout isn't going to start a fire, I've turned it on a ton of times with no flames. No engines or rolling stock is normally on the tracks, so there won't be any runaway and derailment to potentially cause a short.
Nothing is perfect, that that's way down the list of things I think about when I think of electrical safety... I suspect the extension cords or the computers that get left on 24/7 are a lot more likely to be a source of problems than my train layout.