I'm not completely sure, but look — I created a randomizer based on your recommendation, like this:
{{Walking|Sitting} in {Forest|Cave|Fantasy City}}
The problem is that when I click the Service button, it randomly picks one of these options, which works fine.
But when I click Regenerate Image, it only generates from the option that Service already selected before, instead of picking a new random one.
It would be great if Regenerate could also trigger a new random selection each time.