Hi WiFitTrainr,
Thanks for posting back. I really appreciate that you’ve chipped in. It was an interesting idea for the Soft Actor Reference, but on a first pass it doesn’t look like that type can be “Exposed to Cinematics” 
I’m also a bit unsure about serialization support. You seem to have much more deep understanding of this than I, but my sequences contain heaps of working AActor references. There are at least 2 in the image above.
It seems somebody has thought about this because the Type AActor* HAS been cleared as safe to “Expose to Cinematics” so by inference it should be setable otherwise why allow the expose?
Also worth noting that I couldn’t Sequencer UI wouldn’t let me set the reference in the track until I had added the Actor to the sequence itself. Which makes sense, the asset would want to have some sort of implied understanding of what’s in scope.
Kinda wondering if I should log a bug report for this and see where it goes?