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So, if I know the destination addresses on each port in advance I can program it to behave like an L2 switch (with proper multicast even), and I can use code to reprogram it whenever the traffic pattern changes?

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The L1 path can't do any address matching and you can't overlap sources - like Ghostbusters, no crossing the streams. You can source port 1 to ports 2-4 (multicast, but static and unidirectional) and you can change a bidir connection between pairs of ports. The signal gets replicated regardless of what's in the frame. It wouldn't be practical to make it behave quite like an L2 switch.

Apologies, my post was not precise enough, but I think I got it.

> It wouldn't be practical to make it behave quite like an L2 switch.

What are typical configuration? If you’re allowed to talk about it.

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