Thanks for the purchase! Regarding the trainsim.com thread, feel free to post at either place. You'll probably get faster replies over there, but your posts here are useful for those who are not familiar with that thread.
Thinking more closely about your question, I think someone else asked the same thing at the trainsim.com thread, and it was even the same signal! Here's the first page of that discussion on the thread. What isn't mentioned is the approach control: you get a caution from the distant and the actual signal remains at danger until the signalman is satisfied that you're not going to exceed the 25mph limit for the turnouts of the diverging route.