yes I do
I've connected 2 remotes to a single hub and this is what happened:
The moment the remote goes out of range it starts to power down. Before it goes out of range it starts showing the blinking search colour you see when you start it up over the colour of the connection (e.g. green).
Yes, that was the point of my experiment in the blog article. Since the 2nd remote is still in range the hub doesn't lose connection to the network and so the rain motor keeps running.
Answered after your first question, but for the sake of completeness, yes, it powers down as soon as it loses connection to all elements in the network
If you bring the remote back into range and press the green button it reconnects almost instantly.
If you have a 2nd remote you could put it on the train that could go out of range. But you could also "hide" it in the centre of your layout so it never goes out of range of the train hub.
I did find a strange behaviour that i had not seen before: I can only use the first remote I connect. The second remote connects to the network and works as a "bridge", but I cannot get the hub to respond to the 2nd remote I add to the network. I have tried connecting the remotes in reverse order and whatever I do, only the 1st one connected will control the other hub(s) in the network.